Question

figure of speech used in the line" love quoth he but vanity sets love a task like that!"

Answer 1

A caesura is a pause, usually at the middle of a line of poetry. Notice there are fourteen syllables in each of Hunt's lines. There are usually eight syllables before a comma or semicolon, then six syllables following. This is usually seen in 'ballad meter'. That is, in the format below:

King Francis was a hearty king,

and loved a royal sport,

And one day, as his lions fought,

sat looking on the court.

Synecdoche is a figure of speech meaning to use 'the part for the whole', such as 'all hands on deck!', ordering sailors (hands) about