racerunner vs race runner

racerunner and race runner both are nouns.

Word	Noun	Adjective	Verb	Adverb
racerunner	Yes	No	No	No
race runner	Yes	No	No	No

As nouns, racerunner and race runner are synonyms defined as:

racerunner and race runner: very swift lizard of eastern and central United States

Other synonyms of racerunner include Cnemidophorus sexlineatus, six-lined racerunner.

racerunner (noun)	race runner (noun)
very swift lizard of eastern and central United States	very swift lizard of eastern and central United States