Filtering words from https://github.com/open-dict-data/ipa-dict/

ipa_filter.js

const x = `adversely	/ædˈvɝsɫi/
adversity	/ædˈvɝsɪˌti/, /ədˈvɝsɪti/
advert	/ˈædvɝt/
advertise	/ˈædvɝˌtaɪz/
advertised	/ˈædvɝˌtaɪzd/, /ˌædvɝˈtaɪzd/
advertisement	/ˌædvɝˈtaɪzmənt/, /ædˈvɝtəzmənt/
advertisements	/ˈædvɝˌtaɪzmənts/
advertiser	/ˈædvɝˌtaɪzɝ/`

const y = x.split("\n").map(p => p.split("\t").filter(v => v));
const z = y.map(([word, ipa]) => [word, ipa]);

// 0=initial, 1=medial, 2=final
let mode = 1;
let letter = "h";

console.log(
    z.filter(([word, ipa]) => {
        const ps = ipa.replace(/[ˈˌ]/gi, '').split(", ").map(p => p.slice(1, -1));
        
        if (mode === 0) return ps.some(p => p.startsWith(letter));
        if (mode === 1) return ps.some(p => p.slice(1, -1).includes(letter));
        if (mode === 2) return ps.some(p => p.endsWith(letter));
    })
    // randomize array
    .map((a) => ({ sort: Math.random(), value: a }))
    .sort((a, b) => a.sort - b.sort)
    .map((a) => a.value)
    // join
    .join("\n")
);

there are some issues with medial ʃ (like with dʃ), but these are things that would have to be manually handled. maybe if this was an actual project