think factory vs think tank

think factory and think tank both are nouns.

Word	Noun	Adjective	Verb	Adverb
think factory	Yes	No	No	No
think tank	Yes	No	No	No

As nouns, think factory and think tank are synonyms defined as:

think factory and think tank: a company that does research for hire and issues reports on the implications

think factory (noun)	think tank (noun)
a company that does research for hire and issues reports on the implications	a company that does research for hire and issues reports on the implications