As a verb compel

is (transitive|archaic|literally) to drive together, round up.

As an adjective mandatory is

obligatory; required or commanded by authority.

As a noun mandatory is

(dated|rare) a person, organisation or state who receives a mandate; a mandatary.

As nouns the difference between conqueror and conquering

is that conqueror is someone who conquers while conquering is conquest.

As a verb conquering is

present participle of lang=en.

As nouns the difference between progressive and advancing

is that progressive is a member or supporter of a while advancing is the act of proceeding forward; an advance.

As an adjective progressive

is belonging to or supporting a.

As a verb advancing is

.

In transitive terms the difference between firm and toughen

is that firm is to make compact or resistant to pressure; solidify while toughen is to make tough.

In intransitive terms the difference between firm and toughen

is that firm is Aust. To shorten (of betting odds) while toughen is to become tough.

As a noun firm

is a business partnership; the name under which it trades.

As an adjective firm

is steadfast, secure, hard (in position.

As nouns the difference between volatilities and fluctuations

is that volatilities is while fluctuations is .

As adjectives the difference between smooth and net

is that smooth is having a texture that lacks friction. Not rough while net is good, desirable; clean, decent, clear.

As adverbs the difference between smooth and net

is that smooth is smoothly while net is after expenses or deductions.

As nouns the difference between smooth and net

is that smooth is something that is smooth, or that goes smoothly and easily while net is a mesh of string, cord or rope.

As verbs the difference between smooth and net

is that smooth is to make smooth or even while net is to catch by means of a net.

As a proper noun Net is

the Internet.

As nouns the difference between formula and framework

is that formula is any mathematical rule expressed symbolically while framework is   The arrangement of support beams that represent a building's general shape and size.

As a symbol sk

is the symbol for the slovak koruna.

As a noun photography is

the art and technology of producing images on photosensitive surfaces, and its digital counterpart.

As verbs the difference between rowing and kayak

is that rowing is while kayak is (label) to use a kayak, to travel or race in a kayak.

As nouns the difference between rowing and kayak

is that rowing is the action of the verb to row while kayak is a type of small boat, powered by the occupant or occupants using a double-bladed paddle in a sitting position.

As adjectives the difference between repulsive and compulsive

is that repulsive is tending to rouse aversion or to repulse while compulsive is uncontrolled or reactive and unconscious.

As a noun compulsive is

one who exhibits compulsive behaviours.