Lego vs Lego set

Lego and Lego set both are nouns.

Word	Noun	Adjective	Verb	Adverb
Lego	Yes	No	No	No
Lego set	Yes	No	No	No

As nouns, Lego and Lego set are synonyms defined as:

Lego and Lego set: (trademark) a child's plastic construction set for making mechanical models

Lego (noun)	Lego set (noun)
(trademark) a child's plastic construction set for making mechanical models	(trademark) a child's plastic construction set for making mechanical models