inscription vs lettering

inscription and lettering both are nouns.

Word	Noun	Adjective	Verb	Adverb
inscription	Yes	No	No	No
lettering	Yes	No	No	No

As nouns, inscription and lettering are synonyms defined as:

inscription and lettering: letters inscribed (especially words engraved or carved) on something

inscription (noun)	lettering (noun)
the activity of inscribing (especially carving or engraving) letters or words	letters inscribed (especially words engraved or carved) on something
letters inscribed (especially words engraved or carved) on something
a short message (as in a book or musical work or on a photograph) dedicating it to someone or something