overclothe vs garment

overclothe is not a noun while garment is a noun.

Word	Noun	Adjective	Verb	Adverb
overclothe	No	No	Yes	No
garment	Yes	No	Yes	No

As verbs, garment is a hypernym of overclothe; that is, garment is a word with a broader meaning than overclothe:

Other hypernyms of overclothe include apparel, clothe, dress, enclothe, fit out, garb, habilitate, raiment, tog.

overclothe (noun)	garment (noun)
	an article of clothing

overclothe (verb)	garment (verb)
dress too warmly	provide with clothes or put clothes on