喻 is a bound form (b.f.) that cannot stand alone as a word in modern Chinese. It carries the core sense of 'metaphor' or 'to comprehend/explain through analogy.' You'll encounter it primarily in compounds like 比喻 (bǐyù, 'metaphor') and the set phrase 不可理喻 (bùkě lǐ yù, 'impossible to reason with; incomprehensible'). Because it is always attached to another morpheme, its exact meaning depends on the compound.