They are mis-spelled in the 1880 index:

Name: Richard Butter
Home in 1880: Georgetown, Scott, Kentucky
Age: 30
Estimated birth year: abt 1850
Birthplace: Kentucky
Relation to head-of-household: Head
Spouse's name: Mattie
Father's birthplace: KY
Mother's birthplace: KY
Neighbors: View others on page
Occupation: Farm Hand
Marital Status: Married
Race: Black
Gender: Male

Household Members: Name Age
Richard Butter 30
Mattie Butter 30
Henry Butter 9
James Butter 4
Cora Butter 2
Oscar Butter 4M

He is also misspelled in 1870:
Name: Dick Butter
Estimated birth year: abt 1846
Age in 1870: 24
Birthplace: Virginia
Home in 1870: Georgetown, Scott, Kentucky
Family and neighbors: View Results
Race: Black
Gender: Male
Post Office: Georgetown

listed working as a farm hand