superman vs Lucy in the sky with diamonds

superman and Lucy in the sky with diamonds both are nouns.

Word	Noun	Adjective	Verb	Adverb
superman	Yes	No	No	No
Lucy in the sky with diamonds	Yes	No	No	No

As nouns, superman and Lucy in the sky with diamonds are synonyms defined as:

superman and Lucy in the sky with diamonds: street name for lysergic acid diethylamide

Other synonyms of superman include acid, back breaker, battery-acid, dose, dot, Elvis, loony toons, pane, window pane, Zen.

superman (noun)	Lucy in the sky with diamonds (noun)
street name for lysergic acid diethylamide	street name for lysergic acid diethylamide
a person with great powers and abilities