cheapest

As adjectives the difference between cheapest and chief

is that cheapest is (cheap) while chief is primary; principal.

As a noun chief is

(senseid)a leader or head of a group of people, organisation, etc.

As adjectives the difference between cheaper and cheapest

is that cheaper is (cheap) while cheapest is (cheap).

As adjectives the difference between cheap and cheapest

is that cheap is low and/or reduced in price while cheapest is (cheap).

As a noun cheap

is trade; traffic; chaffer; chaffering.

As a verb cheap

is (obsolete) to trade; traffic; bargain; chaffer; ask the price of goods; cheapen goods.

As an adverb cheap

is cheaply.

As adjectives the difference between goodest and cheapest

is that goodest is superlative of good while cheapest is superlative of cheap.

As adjectives the difference between cheapest and economical

is that cheapest is superlative of cheap while economical is careful with money so as not to spend too much; prudent; thrifty.

As a verb heapest

is archaic second-person singular of heap.

As an adjective cheapest is

superlative of cheap.

As a verb cheatest

is archaic second-person singular of cheat.

As an adjective cheapest is

superlative of cheap.