field horsetail vs common horsetail

field horsetail and common horsetail both are nouns.

Word	Noun	Adjective	Verb	Adverb
field horsetail	Yes	No	No	No
common horsetail	Yes	No	No	No

As nouns, field horsetail and common horsetail are synonyms defined as:

field horsetail and common horsetail: of Eurasia and Greenland and North America

Other synonyms of field horsetail include Equisetum arvense.

field horsetail (noun)	common horsetail (noun)
of Eurasia and Greenland and North America	of Eurasia and Greenland and North America