marlinspike vs marlingspike

marlinspike and marlingspike both are nouns.

Word	Noun	Adjective	Verb	Adverb
marlinspike	Yes	No	No	No
marlingspike	Yes	No	No	No

As nouns, marlinspike and marlingspike are synonyms defined as:

marlinspike and marlingspike: a pointed iron hand tool that is used to separate strands of a rope or cable (as in splicing)

Other synonyms of marlinspike include marlinespike.

marlinspike (noun)	marlingspike (noun)
a pointed iron hand tool that is used to separate strands of a rope or cable (as in splicing)	a pointed iron hand tool that is used to separate strands of a rope or cable (as in splicing)