Gnar

Part of speech: noun (n.)

A knot or gnarl in wood; hence, a tough, thickset man; -- written also gnarr. [Archaic] He was . . . a thick gnarre. Chaucer.

Part of speech: verb (v.)

To gnarl; to snarl; to growl; -- written also gnarr. [Archaic] At them he gan to rear his bristles strong, And felly gnarre. Spenser. A thousand wants Gnarr at the heels of men. Tennison.