absinthe vs absinth

absinthe and absinth both are nouns.

Word	Noun	Adjective	Verb	Adverb
absinthe	Yes	No	No	No
absinth	Yes	No	No	No

As nouns, absinthe and absinth are synonyms defined as:

absinthe and absinth: strong green liqueur flavored with wormwood and anise

absinthe (noun)	absinth (noun)
strong green liqueur flavored with wormwood and anise	strong green liqueur flavored with wormwood and anise
aromatic herb of temperate Eurasia and North Africa having a bitter taste used in making the liqueur absinthe