lese majesty vs high treason

lese majesty and high treason both are nouns.

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

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

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

Other synonyms of lese majesty include treason.

lese majesty (noun)	high treason (noun)
a crime that undermines the offender's government	a crime that undermines the offender's government