As nouns the difference between efficacy and optimization

is that efficacy is (uncountable) ability to produce a desired amount of a desired effect while optimization is the design and operation of a system or process to make it as good as possible in some defined sense.

As adverbs the difference between aback and suddenly

is that aback is (archaic) towards the back or rear; backwards while suddenly is happening quickly and with little or no warning; in a sudden manner.

As a noun aback

is (obsolete) an abacus.

As nouns the difference between strapping and wrappers

is that strapping is adhesive plaster for strapping injuries while wrappers is plural of wrapper.

As a verb strapping

is present participle of lang=en.

As an adjective strapping

is of a young woman full of vigor; lusty.

As nouns the difference between renovation and rebuild

is that renovation is renovation while rebuild is an act of rebuilding.

As a verb rebuild is

to build again.

As nouns the difference between separate and separation

is that separate is (usually|in the plural) anything that is sold by itself, especially an article of clothing while separation is separation.

As an adjective separate

is apart from (the rest); not connected to or attached to (anything else).

As a verb separate

is to divide (a thing) into separate parts.

As a noun or

is gold.

As a pronoun so is

this;.

As nouns the difference between buildability and constructability

is that buildability is the quality of being buildable while constructability is .

As a proper noun combine

is (colloquial) london underground.

As a noun bond is

.

As a noun honesty

is honor, decency, propriety.

As an adverb openly is

in an open manner, visibly, not covertly.

As verbs the difference between estimated and evaluated

is that estimated is past tense of estimate while evaluated is past tense of evaluate.