Heimlich manoeuvre vs Heimlich maneuver

Heimlich manoeuvre and Heimlich maneuver both are nouns.

Word	Noun	Adjective	Verb	Adverb
Heimlich manoeuvre	Yes	No	No	No
Heimlich maneuver	Yes	No	No	No

As nouns, Heimlich manoeuvre and Heimlich maneuver are synonyms defined as:

Heimlich manoeuvre and Heimlich maneuver: an emergency procedure to help someone who is choking because food is lodged in the trachea

Heimlich manoeuvre (noun)	Heimlich maneuver (noun)
an emergency procedure to help someone who is choking because food is lodged in the trachea	an emergency procedure to help someone who is choking because food is lodged in the trachea