think of vs think about

think of and think about both are verbs.

Word	Noun	Adjective	Verb	Adverb
think of	No	No	Yes	No
think about	No	No	Yes	No

As verbs, think of and think about are synonyms defined as:

Other synonyms of think of include entertain, flirt with, toy with.

think of (verb)	think about (verb)
keep in mind for attention or consideration	take into consideration, have in view
look on as or consider	have on one's mind, think about actively
intend to refer to
take into consideration, have in view
choose in one's mind
devise or invent