mull vs puzzle

mull and puzzle both are nouns.

Word	Noun	Adjective	Verb	Adverb
mull	Yes	No	Yes	No
puzzle	Yes	No	Yes	No

As verbs, puzzle is a hyponym of mull; that is, puzzle is a word with a more specific, narrower meaning than mull:

mull: reflect deeply on a subject
puzzle: be uncertain about; think about without fully understanding or being able to decide

mull (noun)	puzzle (noun)
a term used in Scottish names of promontories	a game that tests your ingenuity
	a particularly baffling problem that is said to have a correct solution

mull (verb)	puzzle (verb)
reflect deeply on a subject	be a mystery or bewildering to
heat with sugar and spices to make a hot drink	be uncertain about; think about without fully understanding or being able to decide