safari vs expedition

safari and expedition both are nouns.

Word	Noun	Adjective	Verb	Adverb
safari	Yes	No	No	No
expedition	Yes	No	No	No

As nouns, expedition is a hypernym of safari; that is, expedition is a word with a broader meaning than safari:

safari (noun)	expedition (noun)
an overland journey by hunters (especially in Africa)	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