As a proper noun beatles is

an extremely successful and influential british rock music quartet that operated primarily in the 1960s.

As nouns the difference between penguin and petrel

is that penguin is any of several flightless sea birds, of order sphenisciformes , found in the southern hemisphere; marked by their usual upright stance, walking on short legs, and (generally) their stark black and white plumage while petrel is petrel (bird).

As nouns the difference between simultaneity and synchronization

is that simultaneity is the quality or state of being simultaneous; simultaneousness while synchronization is the state or property of being synchronized.

As an adjective previous

is prior; occurring before something else, either in time or order.

As a noun previous

is an existing criminal record; short for "previous convictions".

As a verb proceeded is

past tense of proceed.

As an adjective immemorial

is immemorial, age-old.

As a noun old is

age.

As adjectives the difference between analog and simulate

is that analog is in which the value of a data item (such as time) is represented by a continuously variable physical quantity that can be measured (such as the shadow of a sundial while simulate is feigned; pretended.

As a noun analog

is something that bears an analogy to something else.

As a verb simulate is

to model, replicate, duplicate the behavior, appearance or properties of.

As a verb raving

is .

As a noun raving

is (usually plural) wild, incoherent, or irrational talk.

As an adjective raving

is talking wildly.

As an adverb raving

is incoherently.

As a pronoun mad is

.

As nouns the difference between egestion and injection

is that egestion is the excretion of undigested food as faeces while injection is the act of injecting, or something that is injected.

In lang=en terms the difference between sacrifice and renege

is that sacrifice is to trade (a value of higher worth) for one of lesser worth in order to gain something else valued more such as an ally or business relationship or to avoid an even greater loss; to sell without profit to gain something other than money while renege is in a card game, to break one's commitment to follow suit when capable.

As verbs the difference between sacrifice and renege

is that sacrifice is to offer (something) as a gift to a deity while renege is to break a promise or commitment; to go back on one's word.

As a noun sacrifice

is the offering of anything to a god; consecratory rite.

As nouns the difference between think and kook

is that think is an act of thinking; consideration (of something) while kook is kitchen.

As a verb think

is (label) to ponder, to go over in one's head or think can be (label) to seem, to appear.