Protector is a related term of refuge.

As nouns the difference between protector and refuge

is that protector is someone who protects or guards, by assignment or on their own initiative while refuge is a state of safety, protection or shelter.

As a verb refuge is

to return to a place of shelter.

As nouns the difference between capacity and efficacy

is that capacity is the ability to hold, receive or absorb while efficacy is ability to produce a desired amount of a desired effect.

As an adjective capacity

is filling the allotted space.

As adverbs the difference between justly and forthrightly

is that justly is in a just or fair manner; rightfully while forthrightly is in a forthright manner.

Mildewed is a related term of tainted.

As verbs the difference between mildewed and tainted

is that mildewed is (mildew) while tainted is (taint).

As an adjective tainted is

corrupted or filled with imperfections.

Parochial is a related term of shallow.

As adjectives the difference between parochial and shallow

is that parochial is pertaining to a parish while shallow is having little depth; significantly less deep than wide.

As a noun shallow is

a shallow portion of an otherwise deep body of water.

As a verb shallow is

to make or become less deep.

Sully is a related term of spot.

As a verb sully

is to soil or stain; to dirty.

As a noun spot is

.

Clout is a related term of box.

As nouns the difference between clout and box

is that clout is influence or effectiveness, especially political while box is box (rectangular container).

As a verb clout

is to hit, especially with the fist.

Potent is a related term of valorous.

As adjectives the difference between potent and valorous

is that potent is possessing strength while valorous is having or displaying valour.

As a noun potent

is (tincture) a heraldic fur formed by a regular tessellation of blue and white t shapes.

Discouraged is a related term of spiritless.

As adjectives the difference between discouraged and spiritless

is that discouraged is having lost confidence or hope; dejected; disheartened while spiritless is lacking energy, drive, motivation or emotion enervated.

As a verb discouraged

is (discourage).

In geometry terms the difference between circumference and edge

is that circumference is the length of such a line while edge is a one-dimensional face of a polytope. In particular, the joining line between two vertices of a polygon; the place where two faces of a polyhedron meet.