mandrel vs mandril

mandrel and mandril both are nouns.

Word	Noun	Adjective	Verb	Adverb
mandrel	Yes	No	No	No
mandril	Yes	No	No	No

As nouns, mandrel and mandril are synonyms defined as:

mandrel and mandril: any of various rotating shafts that serve as axes for larger rotating parts

Other synonyms of mandrel include arbor, spindle.

mandrel (noun)	mandril (noun)
any of various rotating shafts that serve as axes for larger rotating parts	any of various rotating shafts that serve as axes for larger rotating parts