Words that rhyme with nastier

What do these rhymes mean?

anterior

of or near the head end or toward the front plane of a body earlier in time a tooth situated at the front of the mouth

barrier

a structure or object that impedes free movement any condition that makes it difficult to make progress or to achieve

binuclear

having two nuclei

caviar

salted roe of sturgeon or other large fish; usually served as an hors d'oeuvre

copier

apparatus that makes copies of typed, written or drawn material