tugboat vs tower

tugboat and tower both are nouns.

Word	Noun	Adjective	Verb	Adverb
tugboat	Yes	No	No	No
tower	Yes	No	Yes	No

As nouns, tugboat and tower are synonyms defined as:

tugboat and tower: a powerful small boat designed to pull or push larger ships

Other synonyms of tugboat include towboat, tug.

tugboat (noun)	tower (noun)
a powerful small boat designed to pull or push larger ships	a structure taller than its diameter; can stand alone or be attached to a larger building
	anything that approximates the shape of a column or tower
	a powerful small boat designed to pull or push larger ships

tugboat (verb)	tower (verb)
	appear very large or occupy a commanding position