Post.
tense
host, most, boast, toast go to coast, post, roast, etc. most, host, toast, boast, coast, post, roast, etc.
Extensive, Pensive, Hypertensive, Defensive
limb
Bough.
tense
boast, ghost, host, post, roast, toast
ghost boast
no
coast, boast, toast, most,etc.
Fence, pence, sense, tense, whence
Yes, the end rhymes in Beowulf's boast are in the form of alliteration rather than traditional end rhymes found in later poetry. In Old English poetry, alliteration (repeated initial sounds) was used to create rhythm and structure within the lines.
something like "i gotta fence" makes me tense
I say it's a verb
host, most, boast, toast go to coast, post, roast, etc. most, host, toast, boast, coast, post, roast, etc.
Extensive, Pensive, Hypertensive, Defensive
No