young vs offspring

young and offspring both are nouns.

Word	Noun	Adjective	Verb	Adverb
young	Yes	Yes	No	No
offspring	Yes	No	No	No

As nouns, young and offspring are synonyms defined as:

young (noun)	offspring (noun)
any immature animal	any immature animal
young people collectively	something that comes into existence as a result
	the immediate descendants of a person

young (adjective)	offspring (adjective)
(used of living things especially persons) in an early period of life or development or growth
(of crops) harvested at an early stage of development; before complete maturity
not tried or tested by experience
being in its early stage
suggestive of youth; vigorous and fresh