lad vs chap

lad and chap both are nouns.

Word	Noun	Adjective	Verb	Adverb
lad	Yes	No	No	No
chap	Yes	No	Yes	No

As nouns, lad and chap are synonyms defined as:

Other synonyms of lad include blighter, bloke, cuss, fella, feller, fellow, gent.

lad (noun)	chap (noun)
a male child (a familiar term of address to a boy)	(usually in the plural) leather leggings without a seat; joined by a belt; often have flared outer flaps; worn over trousers by cowboys to protect their legs
a boy or man	a crack in a lip caused usually by cold
	a boy or man
	a long narrow depression in a surface

lad (verb)	chap (verb)
	crack due to dehydration