different between knurl vs tubercle

English

knur +? -le (“diminutive”), from Middle English knarre (“knot in wood”), earlier sense “a stone”, likely influenced by Old Norse kn?rr.

gnarl is a later variant, from gnarled, via knurled.

knurl (plural knurls)

A contorted knot in wood.
A crossgrained protuberance; a nodule; a boss or projection.
A lined or crossgrained pattern of ridges or indentations rolled or pressed into a part for grip.

knurl (third-person singular simple present knurls, present participle knurling, simple past and past participle knurled)

From Latin tuberculum.

tubercle (plural tubercles)

(anatomy) A round nodule, small eminence, or warty outgrowth, especially those found on bones for the attachment of a muscle or ligament or small elevations on the surface of a tooth.
(botany) A small rounded wartlike protuberance of the roots of some leguminous plants; the lip of certain orchids, cacti.
(pathology) A small rounded nodule forming the characteristic lesion of tuberculosis.

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