undertenant

is likely misspelled.

has no English definition.

As a noun undertenant

is a tenant who holds property from another tenant; a subtenant.

As nouns the difference between terms and undertenant

is that terms is while undertenant is a tenant who holds property from another tenant; a subtenant.

As nouns the difference between undertenant and undertenancy

is that undertenant is a tenant who holds property from another tenant; a subtenant while undertenancy is the tenancy of an undertenant; a subletting arrangement.

As nouns the difference between subtenant and undertenant

is that subtenant is someone who sublets, a person who rents from a tenant while undertenant is a tenant who holds property from another tenant; a subtenant.

As nouns the difference between tenant and undertenant

is that tenant is one who pays a fee (rent) in return for the use of land, buildings, or other property owned by others while undertenant is a tenant who holds property from another tenant; a subtenant.

As a verb tenant

is to hold as, or be, a tenant.