As nouns the difference between secondary and ootid

is that secondary is while ootid is .

As an adjective secondary

is succeeding next in order to the first; of second place, origin, rank, rank, etc; not primary; subordinate; not of the first order or rate.

As nouns the difference between oocyte and ootid

is that oocyte is a cell that develops into an egg or ovum; a female gametocyte while ootid is the haploid cell, produced by meiotic division of a secondary oocyte, that is a nearly mature ovum.

As adjectives the difference between extinct and notoungulate

is that extinct is (dated) extinguished, no longer alight (of fire, candles etc) while notoungulate is characteristic of these animals.

As a noun notoungulate is

(biology) any of several extinct, hoofed, herbivorous mammals, of the order (taxlink) , from cenozoic south america.

As adjectives the difference between hoofed and notoungulate

is that hoofed is having a hoof while notoungulate is characteristic of these animals.

As a verb hoofed

is (hoof).

As a noun notoungulate is

(biology) any of several extinct, hoofed, herbivorous mammals, of the order (taxlink) , from cenozoic south america.

As adjectives the difference between herbivorous and notoungulate

is that herbivorous is feeding chiefly on plants while notoungulate is characteristic of these animals.

As a noun notoungulate is

(biology) any of several extinct, hoofed, herbivorous mammals, of the order (taxlink) , from cenozoic south america.

As nouns the difference between mammal and notoungulate

is that mammal is an animal of the class mammalia, characterized by being warm-blooded, having hair and feeding milk to its young while notoungulate is (biology) any of several extinct, hoofed, herbivorous mammals, of the order (taxlink) , from cenozoic south america.

As an adjective notoungulate is

characteristic of these animals.

As adjectives the difference between cenozoic and notoungulate

is that cenozoic is (geology) of or pertaining to the cenozoic while notoungulate is characteristic of these animals.

As a proper noun cenozoic

is (geology) a geologic era within the phanerozoic eon comprising the paleogene and neogene from about 65 million years ago to the present, when the continents moved to their current position and modern plants and animals evolved.

As a noun notoungulate is

(biology) any of several extinct, hoofed, herbivorous mammals, of the order (taxlink) , from cenozoic south america.

As an adjective immature

is not fully formed or developed, unripe, not mature.

As a noun oogonium is

.

As an adjective ovarian

is relating to the ovaries.

As a noun oogonium is

an immature ovarian egg within a developing fetus.

As nouns the difference between egg and oogonium

is that egg is (zoology|countable) an approximately spherical or ellipsoidal body produced by birds, snakes, insects and other animals, housing the embryo during its development while oogonium is .

As a verb egg

is to throw eggs at or egg can be to encourage, incite.