ice axe vs ice ax

ice axe and ice ax both are nouns.

Word	Noun	Adjective	Verb	Adverb
ice axe	Yes	No	No	No
ice ax	Yes	No	No	No

As nouns, ice axe and ice ax are synonyms defined as:

ice axe and ice ax: an ax used by mountain climbers for cutting footholds in ice

Other synonyms of ice axe include piolet.

ice axe (noun)	ice ax (noun)
an ax used by mountain climbers for cutting footholds in ice	an ax used by mountain climbers for cutting footholds in ice