This is an example of what the different fonts and sizes look like in latex
$$\rm \tiny \text{tiny roman text}$$
$$\rm \scriptsize \text{scriptsize roman text}$$
$$\rm \small \text{small roman text}$$
$$\rm \normalsize \text{normal roman text}$$
$$\rm \large \text{large roman text}$$
$$\rm \Large \text{Large roman text}$$
$$\rm \LARGE \text{LARGE roman text}$$
$$\rm \huge \text{huge roman text}$$
$$\rm \Huge \text{Huge roman text}$$
$$\oldstyle \tiny \text{tiny oldstyle text}$$
$$\oldstyle \scriptsize \text{scriptsize oldstyle text}$$
$$\oldstyle \small \text{small oldstyle text}$$
$$\oldstyle \normalsize \text{normal oldstyle text}$$
$$\oldstyle \large \text{large oldstyle text}$$
$$\oldstyle \Large \text{Large oldstyle text}$$
$$\oldstyle \LARGE \text{LARGE oldstyle text}$$
$$\oldstyle \huge \text{huge oldstyle text}$$
$$\oldstyle \Huge \text{Huge oldstyle text}$$
$$\cal \tiny \text{tiny calligraphic text}$$
$$\cal \scriptsize \text{scriptsize calligraphic text}$$
$$\cal \small \text{small calligraphic text}$$
$$\cal \normalsize \text{normal calligraphic text}$$
$$\cal \large \text{large calligraphic text}$$
$$\cal \Large \text{Large calligraphic text}$$
$$\cal \LARGE \text{LARGE calligraphic text}$$
$$\cal \huge \text{huge calligraphic text}$$
$$\cal \Huge \text{Huge calligraphic text}$$
$$\it \tiny \text{tiny italic text}$$
$$\it \scriptsize \text{scriptsize italic text}$$
$$\it \small \text{small italic text}$$
$$\it \normalsize \text{normal italic text}$$
$$\it \large \text{large italic text}$$
$$\it \Large \text{Large italic text}$$
$$\it \LARGE \text{LARGE italic text}$$
$$\it \huge \text{huge italic text}$$
$$\it \Huge \text{Huge italic text}$$
$$\bf \tiny \text{tiny bold text}$$
$$\bf \scriptsize \text{scriptsize bold text}$$
$$\bf \small \text{small bold text}$$
$$\bf \normalsize \text{normal bold text}$$
$$\bf \large \text{large bold text}$$
$$\bf \Large \text{Large bold text}$$
$$\bf \LARGE \text{LARGE bold text}$$
$$\bf \huge \text{huge bold text}$$
$$\bf \Huge \text{Huge bold text}$$
$$\scr \tiny \text{tiny script text}$$
$$\scr \scriptsize \text{scriptsize script text}$$
$$\scr \small \text{small script text}$$
$$\scr \normalsize \text{normal script text}$$
$$\scr \large \text{large script text}$$
$$\scr \Large \text{Large script text}$$
$$\scr \LARGE \text{LARGE script text}$$
$$\scr \huge \text{huge script text}$$
$$\scr \Huge \text{Huge script text}$$
$$\frak \tiny \text{tiny fraktur text}$$
$$\frak \scriptsize \text{scriptsize fraktur text}$$
$$\frak \small \text{small fraktur text}$$
$$\frak \normalsize \text{normal fraktur text}$$
$$\frak \large \text{large fraktur text}$$
$$\frak \Large \text{Large fraktur text}$$
$$\frak \LARGE \text{LARGE fraktur text}$$
$$\frak \huge \text{huge fraktur text}$$
$$\frak \Huge \text{Huge fraktur text}$$
$$\sf \tiny \text{tiny sans serif text}$$
$$\sf \scriptsize \text{scriptsize sans serif text}$$
$$\sf \small \text{small sans serif text}$$
$$\sf \normalsize \text{normal sans serif text}$$
$$\sf \large \text{large sans serif text}$$
$$\sf \Large \text{Large sans serif text}$$
$$\sf \LARGE \text{LARGE sans serif text}$$
$$\sf \huge \text{huge sans serif text}$$
$$\sf \Huge \text{Huge sans serif text}$$
$$\tt \tiny \text{tiny typewriter text}$$
$$\tt \scriptsize \text{scriptsize typewriter text}$$
$$\tt \small \text{small typewriter text}$$
$$\tt \normalsize \text{normal typewriter text}$$
$$\tt \large \text{large typewriter text}$$
$$\tt \Large \text{Large typewriter text}$$
$$\tt \LARGE \text{LARGE typewriter text}$$
$$\tt \huge \text{huge typewriter text}$$
$$\tt \Huge \text{Huge typewriter text}$$
$$\Bbb \tiny \text{tiny blackboard text}$$
$$\Bbb \scriptsize \text{scriptsize blackboard text}$$
$$\Bbb \small \text{small blackboard text}$$
$$\Bbb \normalsize \text{normal blackboard text}$$
$$\Bbb \large \text{large blackboard text}$$
$$\Bbb \Large \text{Large blackboard text}$$
$$\Bbb \LARGE \text{LARGE blackboard text}$$
$$\Bbb \huge \text{huge blackboard text}$$
$$\Bbb \Huge \text{Huge blackboard text}$$
$$\normalsize \tiny \text{tiny size}$$
$$\normalsize \scriptsize \text{script size}$$
$$\normalsize \small \text{small size}$$
$$\normalsize \normalsize \text{normal size}$$
$$\normalsize \large \text{large size}$$
$$\normalsize \Large \text{Large size}$$
$$\normalsize \LARGE \text{LARGE size}$$
$$\normalsize \huge \text{huge size}$$
$$\normalsize \Huge \text{Huge size}$$