As adjectives the difference between unconstrained and unbounded

is that unconstrained is not constrained while unbounded is having no boundaries or limits.

As nouns the difference between tmt and rebar

is that tmt is sled(ge) while rebar is (countable) a steel reinforcing bar in a reinforced concrete structure.

As a proper noun iblis

is (islam) satan; the devil.

As a noun dajjal is

false messiah, anti-christ, deceiver in islam.

As nouns the difference between relevancy and pertinency

is that relevancy is (legal|scotland) sufficieny (of a statement, claim etc) to carry weight in law; legal pertinence while pertinency is the quality of being pertinent to the matter at hand; relevance.

As adverbs the difference between densely and abundantly

is that densely is in a dense manner while abundantly is in an abundant manner; in a sufficient degree; fully; amply; plentifully; in large measure .