lying under oath vs bearing false witness

lying under oath and bearing false witness both are nouns.

Word	Noun	Adjective	Verb	Adverb
lying under oath	Yes	No	No	No
bearing false witness	Yes	No	No	No

As nouns, lying under oath and bearing false witness are synonyms defined as:

lying under oath and bearing false witness: criminal offense of making false statements under oath

Other synonyms of lying under oath include perjury.

lying under oath (noun)	bearing false witness (noun)
criminal offense of making false statements under oath	criminal offense of making false statements under oath