Mammoth is a related term of weighty.

As adjectives the difference between mammoth and weighty

is that mammoth is comparable to a mammoth in its size; very large, huge, gigantic while weighty is having weight; heavy; ponderous; as, a weighty body.

As a noun mammoth

is any species of the extinct genus mammuthus , of large, usually hairy, elephant-like mammals with long curved tusks and an inclined back, which became extinct with the last retreat of ice age glaciers during the late pleistocene period, and are known from fossils, frozen carcasses, and paleolithic cave paintings found in north america and eurasia.

Restive is a related term of jumpy.

As adjectives the difference between restive and jumpy

is that restive is impatient under delay, duress, or control while jumpy is nervous and excited.

Unknown is a related term of difficult.

As adjectives the difference between unknown and difficult

is that unknown is not known; unidentified; not well known while difficult is hard, not easy, requiring much effort.

As a noun unknown

is (algebra) a variable (usually x'', ''y'' or ''z ) whose value is to be found.

As a verb difficult is

(obsolete|transitive) to make difficult; to impede; to perplex.

As nouns the difference between approbation and acknowledgement

is that approbation is the act of approving; an assenting to the propriety of a thing with some degree of pleasure or satisfaction; approval, sanction, commendation or official recognition while acknowledgement is the act of acknowledging; admission; avowal; owning; confession.

Criminally is a related term of vilely.

As adverbs the difference between criminally and vilely

is that criminally is in a criminal manner while vilely is in a vile manner, evilly, despicably.

Unflinching is a related term of stalwart.

As adjectives the difference between unflinching and stalwart

is that unflinching is without flinching; staying committed despite any difficulty; steadfast while stalwart is firmly built.

As a noun stalwart is

one who has a strong build.

Profit is a related term of pelf.

As nouns the difference between profit and pelf

is that profit is profit while pelf is money; riches; gain; especially when dishonestly acquired (compare lucre).

Institute is a related term of assign.

As nouns the difference between institute and assign

is that institute is while assign is an assignee.

As a verb assign is

(lb) to designate or set apart something for some purpose.

Artful is a related term of knowing.

As adjectives the difference between artful and knowing

is that artful is performed with, or characterized by, art or skill while knowing is possessing knowledge or understanding; intelligent.

As a verb knowing is

.

As a noun knowing is

the act or condition of having knowledge.

Protective is a related term of devoted.

As adjectives the difference between protective and devoted

is that protective is serving, intended or wishing to protect while devoted is vowed; dedicated; consecrated.

As a noun protective

is (british) something that protects.

As a verb devoted is

(devote).