As nouns the difference between tetravalence and tetravalency

is that tetravalence is tetravalence / tetravalency while tetravalency is tetravalence.

As an adjective tetravalent

is having a valence of 4.

As a noun tetravalence is

the condition of being tetravalent.

As adjectives the difference between female and thelytokous

is that female is belonging to the sex which typically produces eggs, which in humans and most other mammals is typically the one which has xx chromosomes; belonging to the sex which has larger gametes (for species which have two sexes and for which this distinction can be made) while thelytokous is that produces female offspring (only).

As a noun female

is one of the female (feminine) sex or gender.

As a noun offspring

is a person's daughter(s) and/or son(s); a person's children.

As an adjective thelytokous is

that produces female offspring (only).

As a noun dinosaur

is any of the creatures belonging to the clade dinosauria, especially those that existed during the triassic, jurassic and cretaceous periods and are now extinct.

As an adjective therizinosauroid is

describing the dinosaurs of the superfamily therizinosauroidea .

As nouns the difference between insect and tachinid

is that insect is an arthropod in the class insecta, characterized by six legs, up to four wings, and a chitinous exoskeleton while tachinid is any insect of the family .