"EFFECT" and "AFFECT"

"Effect" is a noun meaning result. "Affect" is a verb meaning to influence. Ex.: The new policy had a significant effect. The weather can affect our mood.

"COMPLEMENT" and "COMPLIMENT"

"Complement" means to complete or enhance. "Compliment" means to praise or express admiration. Ex.: The sauce complements the dish perfectly. She complimented him on his presentation.