As adjectives the difference between eighth and eightieth
is that eighth is the ordinal form of the number eight while eightieth is the ordinal form of the number eighty.
As nouns the difference between eighth and eightieth
is that eighth is (eighth ones is used for the plural) The person or thing in the eighth position while eightieth is the person or thing in the eightieth position.
eighth
English
Adjective
(head)
The ordinal form of the number eight.
Synonyms
* , 8th; (in names of monarchs and popes ) VIII
Noun
(
en noun)
(eighth ones is used for the plural ) The person or thing in the eighth position.
One of eight equal parts of a whole.
(slang) An "eighth" of an ounce equalling approximately 3.5 grams in marijuana or other drugs.
Synonyms
* (person or thing in the eighth position) eighth one
* (One of eight equal parts) , henry (for an eighth of an ounce of marijuana in the UK)
eightieth
English
Adjective
(-)
The ordinal form of the number eighty.
Synonyms
* , 80th
Noun
(
en noun)
The person or thing in the eightieth position.
One of eighty equal parts of a whole.