pertinate

As a noun terms

is .

As an adjective pertinate is

(obsolete) pertinacious.

As a noun perinate

is (biology) a member of a viviparous species from approximately one month before, to one month after, birth.

As an adjective pertinate is

(obsolete) pertinacious.

As adjectives the difference between pertinate and pectinate

is that pertinate is pertinacious while pectinate is resembling a comb.

As a noun pectinate is

an ester or salt formed of pectinic acid.