girl vs chachka

girl and chachka both are nouns.

Word	Noun	Adjective	Verb	Adverb
girl	Yes	No	No	No
chachka	Yes	No	No	No

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

girl (noun)	chachka (noun)
a young female	(Yiddish) an inexpensive showy trinket
a girl or young woman with whom a man is romantically involved	(Yiddish) an attractive, unconventional woman
a youthful female person
a friendly informal reference to a grown woman
a female human offspring