guard vs Robertson

guard and Robertson both are nouns.

Word	Noun	Adjective	Verb	Adverb
guard	Yes	No	Yes	No
Robertson	Yes	No	No	No

guard (noun)	Robertson (noun)
a position on a basketball team	United States basketball guard (born in 1938)
the duty of serving as a sentry
(American football) a position on the line of scrimmage between the center and the tackles
a precautionary measure warding off impending danger or damage or injury etc.
a device designed to prevent injury or accidents
a posture of defence in boxing or fencing
a military unit serving to protect some place or person
the person who lines up between the center and the tackles on the offensive line of a football team on the line of scrimmage
a person who keeps watch over something or someone
the person who plays the position of guard on a basketball team

guard (verb)	Robertson (verb)
watch over or shield from danger or harm; protect
protect against a challenge or attack
to keep watch over
take precautions in order to avoid some unwanted consequence