tower vs tugboat

tower and tugboat both are nouns.

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

As nouns, tower and tugboat are synonyms defined as:

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

Other synonyms of tower include towboat, tug.

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

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