abandoned infant vs infant

abandoned infant and infant both are nouns.

Word	Noun	Adjective	Verb	Adverb
abandoned infant	Yes	No	No	No
infant	Yes	No	No	No

As nouns, infant is a hypernym of abandoned infant; that is, infant is a word with a broader meaning than abandoned infant:

abandoned infant: a child who has been abandoned and whose parents are unknown
infant: a very young child (birth to 1 year) who has not yet begun to walk or talk

Other hypernyms of abandoned infant include babe, baby.

abandoned infant (noun)	infant (noun)
a child who has been abandoned and whose parents are unknown	a very young child (birth to 1 year) who has not yet begun to walk or talk