single file vs Indian file

single file and Indian file both are nouns.

Word	Noun	Adjective	Verb	Adverb
single file	Yes	No	No	No
Indian file	Yes	No	No	No

As nouns, single file and Indian file are synonyms defined as:

single file and Indian file: a line of persons or things ranged one behind the other

Other synonyms of single file include file.

single file (noun)	Indian file (noun)
a line of persons or things ranged one behind the other	a line of persons or things ranged one behind the other