ruminator vs ponderer

ruminator and ponderer both are nouns.

Word	Noun	Adjective	Verb	Adverb
ruminator	Yes	No	No	No
ponderer	Yes	No	No	No

As nouns, ruminator and ponderer are synonyms defined as:

ruminator and ponderer: a reflective thinker characterized by quiet contemplation

Other synonyms of ruminator include muller, muser.

ruminator (noun)	ponderer (noun)
a reflective thinker characterized by quiet contemplation	a reflective thinker characterized by quiet contemplation