As an adjective airy

is consisting of air; as, an airy substance; the airy parts of bodies.

As a proper noun lively is

.

As nouns the difference between exploration and undertaking

is that exploration is the act of exploring while undertaking is the business of an undertaker, or the management of funerals.

As a verb undertaking is

.

As adjectives the difference between alive and vivacious

is that alive is having life, in opposition to dead; living; being in a state in which the organs perform their functions; as, an animal or a plant which is alive while vivacious is lively and animated; full of life and energy.

As adjectives the difference between enviable and fortunate

is that enviable is arousing or likely to arouse envy while fortunate is coming by good luck or favorable chance.

As an adjective capable

is able and efficient; having the ability needed for a specific task; having the disposition to do something; permitting or being susceptible to something.

As an abbreviation fit is

(travel industry|aviation) fully inclusive tour.

As a noun fulfilment

is the act of fulfilling.

As a verb expertise is

.

As nouns the difference between headedness and sagacity

is that headedness is the state or quality of having a particular type of head while sagacity is the quality of being sage, wise, or able to make good decisions.

As adjectives the difference between unquenched and viable

is that unquenched is not quenched while viable is able to live on its own (as for a newborn).

As nouns the difference between allegation and imputation

is that allegation is an assertion, especially an accusation, not necessarily based on facts while imputation is the act of imputing or charging; attribution; ascription.

As a symbol uniform

is the letter u in the icao spelling alphabet.

As an adjective synonymous is

having a similar meaning.