Spinous vs Spicous - What's the difference?

As adjectives the difference between spinous and spicous

is that spinous is having many spines while spicous is having ears or spikes.

(en adjective)

Having many spines.

Spine-like; spiny.

Of a person, difficult to deal with, prickly.

Of a subject, providing many difficulties, thorny.

(en adjective)

Having ears or spikes