As adjectives the difference between unwavering and false

is that unwavering is never doubted; always steady and on course while false is (label) one of two states of a boolean variable; logic.

As nouns the difference between perpendicularity and verticality

is that perpendicularity is the condition of being perpendicular while verticality is verticalness.

As a noun bioassay

is the analysis of the biological activity of a substance, with reference to a standard preparation, using a culture of living cells, or a living creature.

As an initialism https is

(internet) hypertext transfer protocol secure (http secure), an encrypted form of information transfer on the internet.

As a noun evanescence

is evanescence.

As an adjective false is

(label) one of two states of a boolean variable; logic.

In lang=en terms the difference between invoice and invoke

is that invoice is to bill; to issue an invoice while invoke is to solicit, petition for, appeal to a favorable attitude.

As verbs the difference between invoice and invoke

is that invoice is to bill; to issue an invoice while invoke is to call upon (a person, especially a god) for help, assistance or guidance.

As a noun invoice

is a bill; a commercial document issued by a seller to a buyer indicating the products, quantities and agreed prices for products or services that the seller has already provided the buyer with an invoice indicates that, unless paid in advance, payment is due by the buyer to the seller, according to the agreed terms.

As a pronoun mast

is .

As a noun mastiff is

a large breed of dog often confused to be part of a type of large dogs the mastiff is a breed of its own that is sometimes referred to as an "english mastiff" other breeds have mastiff in their informal name such as "french mastiff" for dogue de bordeaux or include mastiff in their breed names; tibetan mastiff or neapolitan mastiff all are different breeds as well as the often confused bullmastiff.

As nouns the difference between simple and dill

is that simple is (medicine) a preparation made from one plant, as opposed to something made from more than one plant while dill is spot, dot, fleck or dill can be deal, agreement, bargain.

As an adjective simple

is uncomplicated; taken by itself, with nothing added.

As a verb simple

is (transitive|intransitive|archaic) to gather simples, ie, medicinal herbs.

As nouns the difference between salute and kudos

is that salute is while kudos is praise; accolades.

As nouns the difference between pycnogenol and proanthocyanidins

is that pycnogenol is (organic chemistry) any of a group of flavonoids extracted from the bark of pine trees, especially proanthocyanidins while proanthocyanidins is .

As nouns the difference between flashback and souvenir

is that flashback is flashback while souvenir is .