as there are no direct synonyms for 'tell apart' as a whole, I will give you them individually.
tell as a verb - describe, narrate, recite, recount, rehearse, relate, report
apart as an adverb - asunder, piecemeal
also.. I will add in the synonyms for 'difference' as that's generally how you 'tell apart'
difference as a noun - contrast, disagreement, discrepancy, disparateness, disparity, dissimilarity, distinction, distinctiveness, distinctness, diverseness, diversity, unlikeness
dismember
Synonym: fondness, accessory Antonym: aversion
you tell me
portray explain depict illustrate express tell
advise, announce, declare, communicate, express, inform, instruct
A synonym for apart is "Separate".
differentiate, determine, separate, discriminate, judge, ascertain, tell the difference, characterize, mark, single out, set apart
to come apart
dismember
break, separate, split up, fall apart, come apart
Synonym: fondness, accessory Antonym: aversion
you tell me
taking apart, mutilation, torture, torturing
How do you tell goldfish apart there genes
The answer depends on what you want tell it apart from!
broken-down, crumbling, battered, falling apart
apart disconnect away divide split detach