As a noun acorn
is the fruit of the oak, being an oval nut growing in a woody cup or cupule.
As a verb anorn is
(obsolete) to adorn.
Other Comparisons: What's the difference?
The fruit of the oak, being an oval nut growing in a woody cup or cupule.
(nautical) A cone-shaped piece of wood on the point of the spindle above the vane, on the mast-head.
(zoology) See acorn-shell .
(slang, usually in plural) A testicle.
* acorn cup
* acorn nut
* acorn squash
* ride a horse foaled by an acorn
* (fruit of an oak) oak