whelp vs pup

whelp and pup both are nouns.

Word	Noun	Adjective	Verb	Adverb
whelp	Yes	No	Yes	No
pup	Yes	No	Yes	No

As nouns, whelp and pup are synonyms defined as:

As verbs, whelp and pup are synonyms defined as:

whelp (noun)	pup (noun)
young of any of various canines such as a dog or wolf	young of any of various canines such as a dog or wolf
	an inexperienced young person

whelp (verb)	pup (verb)
give birth to (a puppy)	give birth to (a puppy)