colleen vs girl

colleen and girl both are nouns.

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

As nouns, girl is a hypernym of colleen; that is, girl is a word with a broader meaning than colleen:

Other hypernyms of colleen include fille, miss, missy, young lady, young woman.

colleen (noun)	girl (noun)
an Irish girl	a young female
	a girl or young woman with whom a man is romantically involved
	a youthful female person
	a friendly informal reference to a grown woman
	a female human offspring