contemplate vs excogitate

contemplate and excogitate both are verbs.

Word	Noun	Adjective	Verb	Adverb
contemplate	No	No	Yes	No
excogitate	No	No	Yes	No

As verbs, contemplate and excogitate are synonyms defined as:

Other synonyms of contemplate include chew over, meditate, mull, mull over, muse, ponder, reflect, ruminate, speculate, think over.

contemplate (verb)	excogitate (verb)
think intently and at length, as for spiritual purposes	reflect deeply on a subject
reflect deeply on a subject	come up with (an idea, plan, explanation, theory, or principle) after a mental effort
consider as a possibility
look at thoughtfully; observe deep in thought