packet vs packet boat

packet and packet boat both are nouns.

Word	Noun	Adjective	Verb	Adverb
packet	Yes	No	No	No
packet boat	Yes	No	No	No

As nouns, packet and packet boat are synonyms defined as:

Other synonyms of packet include mail boat, mailboat.

packet (noun)	packet boat (noun)
a small package or bundle	a boat for carrying mail
a boat for carrying mail
(computer science) a message or message fragment
a collection of things wrapped or boxed together