bastard vs offspring

bastard and offspring both are nouns.

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

As nouns, offspring is a hypernym of bastard; that is, offspring is a word with a broader meaning than bastard:

Other hypernyms of bastard include issue, progeny.

bastard (noun)	offspring (noun)
derogatory term for a variation that is not genuine; something irregular or inferior or of dubious origin	any immature animal
insulting terms of address for people who are stupid or irritating or ridiculous	something that comes into existence as a result
the illegitimate offspring of unmarried parents	the immediate descendants of a person

bastard (adjective)	offspring (adjective)
fraudulent; having a misleading appearance