populace vs admass

populace and admass both are nouns.

Word	Noun	Adjective	Verb	Adverb
populace	Yes	No	No	No
admass	Yes	No	No	No

As nouns, admass is a hyponym of populace; that is, admass is a word with a more specific, narrower meaning than populace:

populace: people in general considered as a whole
admass: the segment of the public that is easily influenced by mass media (chiefly British)

populace (noun)	admass (noun)
people in general considered as a whole	the segment of the public that is easily influenced by mass media (chiefly British)