lark vs diversion

lark and diversion both are nouns.

Word	Noun	Adjective	Verb	Adverb
lark	Yes	No	Yes	No
diversion	Yes	No	No	No

As nouns, diversion is a hypernym of lark; that is, diversion is a word with a broader meaning than lark:

Other hypernyms of lark include recreation.

lark (noun)	diversion (noun)
any carefree episode	an activity that diverts or amuses or stimulates
any of numerous predominantly Old World birds noted for their singing	a turning aside (of your course or attention or concern)
a songbird that lives mainly on the ground in open country; has streaky brown plumage	an attack calculated to draw enemy defense away from the point of the principal attack
North American songbirds having a yellow breast

lark (verb)	diversion (verb)
play boisterously