crosstie vs railroad tie

crosstie and railroad tie both are nouns.

Word	Noun	Adjective	Verb	Adverb
crosstie	Yes	No	No	No
railroad tie	Yes	No	No	No

As nouns, crosstie and railroad tie are synonyms defined as:

crosstie and railroad tie: one of the cross braces that support the rails on a railway track

Other synonyms of crosstie include sleeper, tie.

crosstie (noun)	railroad tie (noun)
one of the cross braces that support the rails on a railway track	one of the cross braces that support the rails on a railway track