To bourgeon is to grow or develop quickly—in other words to flourish, blossom or sprout.

// The trout population in the stream has burgeoned since the town implemented its laws against overfishing.

An exodus is a situation in which many people leave a place at the same time—in other words, a mass departure or emigration.

// The resort town eagerly anticipated the mass exodus from the cities to its beaches as summer approached.

Something described as palpable is obvious and notable. Palpable may also be used as a synonym of tangible to describe something that can be perceived by one's sense of touch.

// The tension in the courtroom was palpable as the jury foreman stood to announce the verdict.

An act or manner described as gingerly is very cautious or careful.

// It’s a delicate subject, and we need to approach it with gingerly care and tact.

// The antelope moved with a gingerly gait that suggested it was hurt.

Qua is a preposition used in formal speech or writing that means “in the capacity or character of (someone or something).” It is used synonymously with as to indicate that someone or something is being referred to or thought about in a particular way.

// The artist qua artist is less interesting to me than the artist as a human being.

not dense; few and scattered

Something considered inalienable is impossible to take away or give up.

// The American ethos is built on the belief that life, liberty, and the pursuit of happiness are inalienable rights.

To purloin is to take something that belongs to someone else—that is, to steal it. Purloin is much more formal-sounding than steal, but is often—though not always—encountered in humorous contexts, suggesting that the theft is not serious.

// The puppy managed to purloin a few cookies from the plate when no one was looking.

// The studio stepped up security, fearing that someone might attempt to purloin a copy of the script for the show’s season finale.