pleasure trip vs expedition

pleasure trip and expedition both are nouns.

Word	Noun	Adjective	Verb	Adverb
pleasure trip	Yes	No	No	No
expedition	Yes	No	No	No

As nouns, pleasure trip and expedition are synonyms defined as:

Other synonyms of pleasure trip include excursion, jaunt, junket, outing, sashay.

pleasure trip (noun)	expedition (noun)
a journey taken for pleasure	a journey organized for a particular purpose
	a military campaign designed to achieve a specific objective in a foreign country
	a journey taken for pleasure
	the property of being prompt and efficient
	an organized group of people undertaking a journey for a particular purpose