Epitome means the perfect embodiment of a quality, as in the hotel lobby was the epitome of luxury. Epithet means a descriptive term or label attached to a person or thing, which can be neutral, honorific, or insulting. If you mean best example, reach for epitome; if you mean a descriptive nickname or label, reach for epithet.
The core difference
Epitome describes the perfect example of a quality, while epithet describes a term used to characterise a person or thing.
- epitome — the clearest embodiment of a quality: he is the epitome of a workaholic, answering emails even on holiday.
- epithet — a descriptive term applied to a person or thing: Alexander the Great carries a famous epithet.
How to tell them apart
Epitome comes from Greek epitomē, meaning an abridgment, built from epi- plus temnein, to cut; it originally described a condensed summary of a text before it came to mean a perfect, distilled example of a quality. Epithet comes from a separate Greek root, epitheton, meaning something added on, describing a word attached to a name, which is why epithets appear throughout Homer as recurring descriptive tags for gods and heroes.
The two words are unrelated in origin despite their similar look and length. A quick check: epitome pairs with of, as in the epitome of elegance, while epithet is a thing someone is given or called, as in he was known by the epithet the Great. Mixing them up usually happens because both are somewhat formal, multi-syllable nouns about how something or someone is characterised.