airship vs blimp

airship and blimp both are nouns.

Word	Noun	Adjective	Verb	Adverb
airship	Yes	No	No	No
blimp	Yes	No	No	No

As nouns, blimp is a hyponym of airship; that is, blimp is a word with a more specific, narrower meaning than airship:

airship: a steerable self-propelled aircraft
blimp: a small nonrigid airship used for observation or as a barrage balloon

Other hyponyms of airship include barrage balloon, sausage, sausage balloon.

airship (noun)	blimp (noun)
a steerable self-propelled aircraft	a small nonrigid airship used for observation or as a barrage balloon