oldest

Original is a related term of oldest.

As a noun original

is original.

As an adjective oldest is

(old).

As adjectives the difference between congenital and oldest

is that congenital is present since birth while oldest is superlative of old.

Elemental is a related term of oldest.

As adjectives the difference between elemental and oldest

is that elemental is (chemistry) of, relating to, or being an element (as opposed to a compound) while oldest is (old).

As a noun elemental

is (fantasy) a creature (usually a spirit) that is attuned with, or composed of, one of the classical elements: air, earth, fire and water they sometimes have unique proper names and sometimes are referred to as air, earth, fire, or water.

Primeval is a related term of oldest.

As adjectives the difference between primeval and oldest

is that primeval is belonging to the first ages while oldest is (old).

As adjectives the difference between coldest and oldest

is that coldest is superlative of cold while oldest is superlative of old.

As an adjective oldest

is (old).

As a verb foldest is

(archaic) (fold).

As adjectives the difference between oddest and oldest

is that oddest is (odd) while oldest is (old).

As adjectives the difference between oldest and ouldest

is that oldest is (old) while ouldest is (ould).

As adjectives the difference between boldest and oldest

is that boldest is superlative of bold while oldest is superlative of old.

As a verb holdest

is (archaic) second-person singular present simple form of hold .

As an adjective oldest is

(old).