In obsolete|lang=en terms the difference between favor and commend
is that
favor is (obsolete) appearance; look; countenance; face while
commend is (obsolete) commendation; praise.
In obsolete|in the plural|lang=en terms the difference between favor and commend
is that
favor is (obsolete|in the plural) lovelocks while
commend is (obsolete|in the plural) compliments; greetings.
As nouns the difference between favor and commend
is that
favor is a kind or helpful deed; an instance of voluntarily assisting (someone) while
commend is (obsolete) commendation; praise.
As verbs the difference between favor and commend
is that
favor is (transitive) to look upon fondly; to prefer while
commend is to congratulate or reward.