>>11364645sorta yeah. my understanding is that most kanji have a handful of common meanings that are often somewhat related but many have a plethora of lesser meanings that are applicable to a tiny amount of words each
in 人口 it seems 口 is being used as "type" which is one of its meanings but around 20/30 of its other meanings amount to "some variation of mouth/hole"
planned on a big sleep but underestimated your own resting powers?