momentous

As adjectives the difference between momentous and main

is that momentous is outstanding in importance, of great consequence while main is great in size or degree; vast; strong; powerful; important.

As an adverb main is

very; very much; greatly; mightily; extremely; exceedingly.

As a noun main is

strength; power; force; violent effort.

As a proper noun Main is

a river in southern Germany, flowing from Bavaria to the Rhine.

Emphatic is a synonym of momentous.

As adjectives the difference between emphatic and momentous

is that emphatic is characterized by emphasis while momentous is outstanding in importance, of great consequence.

As a noun emphatic

is (phonology) an emphatic consonant.

Momentous is a related term of dangerous.

As adjectives the difference between momentous and dangerous

is that momentous is outstanding in importance, of great consequence while dangerous is full of danger.

Determining is a related term of momentous.

As a verb determining

is .

As an adjective momentous is

outstanding in importance, of great consequence.

Momentous is a related term of distinctive.

As adjectives the difference between momentous and distinctive

is that momentous is outstanding in importance, of great consequence while distinctive is that serves to distinguish between things.

Big is a synonym of momentous.

As a noun big

is a biological insulation garment; an air-tight, full-body suit intended to prevent the spread of contaminants.

As an adjective momentous is

outstanding in importance, of great consequence.

Critical is a related term of momentous.

As adjectives the difference between critical and momentous

is that critical is inclined to find fault or criticize; fastidious; captious; censorious; exacting while momentous is outstanding in importance, of great consequence.

As a noun critical

is a critical value, factor, etc.

Essential is a related term of momentous.

As adjectives the difference between essential and momentous

is that essential is necessary while momentous is outstanding in importance, of great consequence.

As a noun essential

is a necessary ingredient.

Consequential is a related term of momentous.

As adjectives the difference between consequential and momentous

is that consequential is following as a result while momentous is outstanding in importance, of great consequence.