attitude vs high horse

attitude and high horse both are nouns.

Word	Noun	Adjective	Verb	Adverb
attitude	Yes	No	No	No
high horse	Yes	No	No	No

As nouns, high horse is a hyponym of attitude; that is, high horse is a word with a more specific, narrower meaning than attitude:

attitude: a complex mental state involving beliefs and feelings and values and dispositions to act in certain ways
high horse: an attitude of arrogant superiority

attitude (noun)	high horse (noun)
a theatrical pose created for effect	an attitude of arrogant superiority
the arrangement of the body and its limbs
a complex mental state involving beliefs and feelings and values and dispositions to act in certain ways
position of aircraft or spacecraft relative to a frame of reference (the horizon or direction of motion)