spend a penny vs puddle

spend a penny is not a noun while puddle is a noun.

Word	Noun	Adjective	Verb	Adverb
spend a penny	No	No	Yes	No
puddle	Yes	No	Yes	No

As verbs, spend a penny and puddle are synonyms defined as:

spend a penny (noun)	puddle (noun)
	something resembling a pool of liquid
	a small body of standing water (rainwater) or other liquid
	a mixture of wet clay and sand that can be used to line a pond and that is impervious to water when dry

spend a penny (verb)	puddle (verb)
eliminate urine	eliminate urine
	mix up or confuse
	mess around, as in a liquid or paste
	make into a puddle
	work a wet mixture, such as concrete or mud
	make a puddle by splashing water
	dip into mud before planting
	subject to puddling or form by puddling
	wade or dabble in a puddle