Which apostrophe character should I use
Many languages use an apostrophe-like character.
The problem this presents is that the traditional apostrophe (like what we use in English) is a punctuation character. It works okay for saying something's "elided" (like in something's), but it's not appropriate to represent a segment (like glottal stop in Tongan), super-segment (like aspiration in Nivkh or ejective status in Navajo), or modifier (like in Uzbek). There are special characters for this.
Here are some common apostrophe-like characters:
|symbol||name||codepoint||use for what|
|ʻ||turned comma / ʻokina||U02BB|| glottal stop (in Polynesian languages)|
also used for Uzbek oʻ, gʻ, etc.
|ʼ||U02BC||glottal stops, aspiration, etc.|
In theory you'll want to analyse all of these, but generate the correct one for your language. So you'll want spellrelax.