Like expressions?

• Fit as a fiddle and tough as nails
• Some tropes
• Rhetorical comparisons
• "Thick as a Brick" and "Solid as a Rock," e.g
• Animal analogies, often
• Figures of speech often including "as a"
• Comparative phrases
• Like words
• Literary figures?

Wiktionary Word definitions in Wiktionary
n. (plural of simile English)