treason vs lese majesty

treason and lese majesty both are nouns.

Word	Noun	Adjective	Verb	Adverb
treason	Yes	No	No	No
lese majesty	Yes	No	No	No

As nouns, treason and lese majesty are synonyms defined as:

treason and lese majesty: a crime that undermines the offender's government

Other synonyms of treason include high treason.

treason (noun)	lese majesty (noun)
a crime that undermines the offender's government	a crime that undermines the offender's government
an act of deliberate betrayal
disloyalty by virtue of subversive behavior