common horsetail vs field horsetail

common horsetail and field horsetail both are nouns.

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

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

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

Other synonyms of common horsetail include Equisetum arvense.

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