The difference between Perch and Pike-perch

Perch as a noun:

Any of the three species of spiny-finned freshwater fish in the genus Perca.

Perch as a noun (South Africa):

Any of the about 200 related species of fish in the taxonomic family Percidae, especially: , , , , , , Tautogolabrus adspersus

Perch as a noun:

Several similar species in the order Perciformes, such as the grouper.

Perch as a noun:

a rod, staff, or branch of a tree etc used as a roost by a bird

Perch as a noun:

a pole connecting the fore gear and hind gear of a spring carriage; a reach.

Perch as a noun (figurative):

a position that is secure and advantageous, especially one which is prominent or elevated

Perch as a noun (figurative):

a position that is overly elevated or

Perch as a noun (dated):

a linear measure of 5½ yards, equal to a rod, a pole or ¼ chain; the related square measure

Perch as a noun:

a cubic measure of stonework equal to 16.6 × 1.5 × 1 feet

Perch as a noun (textiles):

a frame used to examine cloth

Perch as a noun:

a bar used to support a candle (especially in a church)

Perch as a verb (intransitive):

To rest on (or as if on) a perch; to roost.

Perch as a verb (intransitive):

To stay in an elevated position.

Perch as a verb (transitive):

To place something on (or as if on) a perch.

Perch as a verb (transitive, intransitive, textiles):

To inspect cloth using a perch.

Pike-perch as a noun:

Any of the five species of fish in the genus Sander of the family Percidae (perches and darters).