As a verb insisted

is (insist).

As an adverb instead is

in the place of something (usually mentioned earlier); as a substitute or alternative.

As a noun acrylonitrile

is (organic compound) a toxic colourless liquid organic compound, ch₂=chcn, synthesized from propylene and ammonia; used as a monomer in the production of acrylic resins and synthetic rubber.

As an adjective undefined is

lacking a definition or value.

As nouns the difference between principles and components

is that principles is while components is .

As nouns the difference between stroke and dementia

is that stroke is an act of while dementia is (pathology) a progressive decline in cognitive function due to damage or disease in the brain beyond what might be expected from normal aging areas particularly affected include memory, attention, judgement, language and problem solving.

As a verb stroke

is to move one's hand or an object (such as a broom) along (a surface) in one direction.

As a verb da

is to give.

As an abbreviation fs is

ferrovie dello stato - italian state railway.