tell apart vs secern

tell apart and secern both are verbs.

Word	Noun	Adjective	Verb	Adverb
tell apart	No	No	Yes	No
secern	No	No	Yes	No

As verbs, tell apart and secern are synonyms defined as:

Other synonyms of tell apart include differentiate, distinguish, secernate, separate, severalise, severalize, tell.

tell apart (verb)	secern (verb)
mark as different	mark as different
detect with the senses