muser vs thinker

muser and thinker both are nouns.

Word	Noun	Adjective	Verb	Adverb
muser	Yes	No	No	No
thinker	Yes	No	No	No

As nouns, thinker is a hypernym of muser; that is, thinker is a word with a broader meaning than muser:

muser: a reflective thinker characterized by quiet contemplation
thinker: someone who exercises the mind (usually in an effort to reach a decision)

muser (noun)	thinker (noun)
a reflective thinker characterized by quiet contemplation	an important intellectual
	someone who exercises the mind (usually in an effort to reach a decision)