Anthus pratensis vs titlark

Anthus pratensis and titlark both are nouns.

Word	Noun	Adjective	Verb	Adverb
Anthus pratensis	Yes	No	No	No
titlark	Yes	No	No	No

As nouns, titlark is a hypernym of Anthus pratensis; that is, titlark is a word with a broader meaning than Anthus pratensis:

Anthus pratensis: a common pipit that is brown above and white below; widely distributed in northern and central Europe and in Asia
titlark: a songbird that lives mainly on the ground in open country; has streaky brown plumage

Other hypernyms of Anthus pratensis include lark, pipit.

Anthus pratensis (noun)	titlark (noun)
a common pipit that is brown above and white below; widely distributed in northern and central Europe and in Asia	a songbird that lives mainly on the ground in open country; has streaky brown plumage