As adjectives the difference between theoretical and semiempirical

is that theoretical is of or relating to theory; abstract; not empirical while semiempirical is partially empirical (and partially theoretical).

As an adjective semimetallic

is (inorganic chemistry) of or partaining to a semimetal.

As a noun semimetallicity is

the condition of being semimetallic.

As a verb squared

is past tense of square.

As an adjective squared

is raised to the second power.

As a noun squaredness is

the condition of being squared (or having a squared shape.

As nouns the difference between phenomena and retrocausality

is that phenomena is (phenomenon) while retrocausality is (physics) any of several hypothetical phenomena that reverse causality, allowing an effect to occur before its cause.

As nouns the difference between causality and retrocausality

is that causality is the agency of a cause; the action or power of a cause, in producing its effect while retrocausality is (physics) any of several hypothetical phenomena that reverse causality, allowing an effect to occur before its cause.

As nouns the difference between effect and retrocausality

is that effect is the result or outcome of a cause. See usage notes below.retrocausality is any of several hypothetical phenomena that reverse causality, allowing an effect to occur before its cause.

As a verb effect

is to make or bring about; to implement.

As a verb cause

is .

As a noun retrocausality is

(physics) any of several hypothetical phenomena that reverse causality, allowing an effect to occur before its cause.

As adjectives the difference between algebraic and semialgebraic

is that algebraic is of, or relating to, algebra while semialgebraic is (mathematics) describing any algebraic system in which only real roots are investigated.

Objectivation is a related term of objectification.

As nouns the difference between objectification and objectivation

is that objectification is the process or manifestation of objectifying (something) while objectivation is the conversion of a concept or abstraction into an object.

As nouns the difference between picrylhydrazine and picrylhydrazyl

is that picrylhydrazine is (organic compound) the organic hydrazine obtained formally by replacement of the -oh of picric acid by -nh-nh2 while picrylhydrazyl is (organic chemistry) a free radical derived from picrylhydrazine; any derivative of this compound.