As nouns the difference between altruism and sacrifice

is that altruism is regard for others, both natural and moral without regard for oneself; devotion to the interests of others; brotherly kindness; selflessness; contrasted with egoism or selfishness while sacrifice is the offering of anything to a god; consecratory rite.

As a verb sacrifice is

to offer (something) as a gift to a deity.

As an adjective useful

is having a practical or beneficial use.

As a noun importance is

the quality or condition of being important or worthy of note.

As nouns the difference between totality and tautology

is that totality is the state of being total while tautology is (uncountable) redundant use of words.

As adjectives the difference between limitless and excessive

is that limitless is without limits in extent, size, quantity, and/or comprehensive perception; boundless while excessive is exceeding the usual bounds of something; extravagant; immoderate.

In nautical terms the difference between cat and dolphin

is that cat is to flog with a cat-o'-nine-tails while dolphin is a man-made semi submerged maritime structure, usually installed to provide a fixed structure for temporary mooring, to prevent ships from drifting to shallow water or to serve as base for navigational aids.

As a verb cat

is to hoist (the anchor) by its ring so that it hangs at the cathead.

As an adjective cat

is terrible, disastrous.

As a proper noun Cat

is a diminutive of the female given name Catherine.

As an acronym CAT

is centre for Alternative Technology.

As nouns the difference between warpage and bend

is that warpage is the act of warping while bend is a curve.

As a verb bend is

to cause (something) to change its shape into a curve, by physical force, chemical action, or any other means.

As adjectives the difference between creatable and updateable

is that creatable is that can be created while updateable is that can be updated.

As adjectives the difference between creatable and updatable

is that creatable is that can be created while updatable is (computing) that can be updated.

As adjectives the difference between unknown and unknowing

is that unknown is not known; unidentified; not well known while unknowing is without knowing; ignorant.

As a noun unknown

is a variable (usually x, y or z) whose value is to be found.

As adjectives the difference between new and existing

is that new is recently made, or created while existing is that exists, or has existence, especially that exists now.

As verbs the difference between new and existing

is that new is to make new; to renew while existing is present participle of lang=en.

As an adverb new

is newly (especially in composition).

As a noun new

is things that are new.