As nouns the difference between hindsight and book

is that hindsight is realisation or understanding of the significance and nature of events after they have occurred while book is a collection of sheets of paper bound together to hinge at one edge, containing printed or written material, pictures, etc.

As a verb book is

to reserve (something) for future use.

As a verb bid

is .

As a noun sale is

splinter.

In nautical terms the difference between slab and floor

is that slab is the slack part of a sail while floor is that part of the bottom of a vessel on each side of the keelson which is most nearly horizontal.

As nouns the difference between slab and floor

is that slab is mud, sludge while floor is the bottom or lower part of any room; the supporting surface of a room.

As verbs the difference between slab and floor

is that slab is to make something into a slab while floor is to cover or furnish with a floor.

As an adjective slab

is thick; viscous.

As nouns the difference between slap and floor

is that slap is a blow, especially one given with the open hand, or with something broad and flat while floor is the bottom or lower part of any room; the supporting surface of a room.

As verbs the difference between slap and floor

is that slap is to give a slap while floor is to cover or furnish with a floor.

As an adverb slap

is exactly, precisely.

As a noun uterus

is uterus.

As a verb ova is

to lay eggs.

In lang=en terms the difference between enhance and straighten

is that enhance is to be raised up; to grow larger while straighten is to stand up, especially from a sitting position.

As verbs the difference between enhance and straighten

is that enhance is (obsolete) to lift, raise up while straighten is to cause to become straight.

As a noun effectiveness is

the property of being effective, of achieving results.

As verbs the difference between hewing and pewing

is that hewing is while pewing is .

As nouns the difference between trails and rails

is that trails is while rails is .

As a verb trails

is (trail).

As verbs the difference between swaged and swayed

is that swaged is (swage) while swayed is (sway).

As an adjective swayed is

bent backwards, as in swayback.