sandbur vs field sandbur

sandbur and field sandbur both are nouns.

Word	Noun	Adjective	Verb	Adverb
sandbur	Yes	No	No	No
field sandbur	Yes	No	No	No

As nouns, sandbur and field sandbur are synonyms defined as:

sandbur and field sandbur: grass of the eastern United States and tropical America having spikelets enclosed in prickly burs

Other synonyms of sandbur include Cenchrus tribuloides, sandspur.

sandbur (noun)	field sandbur (noun)
grass of the eastern United States and tropical America having spikelets enclosed in prickly burs	grass of the eastern United States and tropical America having spikelets enclosed in prickly burs