thorn

(n) something that causes irritation and annoyance
- he's a thorn in my flesh
irritant,
(n) a small sharp-pointed tip resembling a spike on a stem or leaf pricker, prickle, spikelet, sticker, spine,
(n) a Germanic character of runic origin

irritant pricker prickle spikelet sticker spine

Thor thou

thole thong Thoth

thorn apple thornbill Thorndike thorniness thornless thorn-tipped Thornton Thornton Niven Wilder Thornton Wilder thorny thorny amaranth thorny skate