"V"erbs
Elementary
Differs by a Vowel
My Deer
Old School
100

To give official sanction to, maybe to help pay for your parking

validate

100

Social studies:
The 3 branches of government are executive, judicial & this

legislative

100

The waltz & a dimwit

dance and dunce

100

To be so frightened as to be unable to move is to be in the thrall of this cervine idiom

a deer [caught] in the headlights

100

This language used to be common even in public school curricula, b
ut in the '60s even the Catholic church dropped it

Latin

200

To leave a job or a room, or to void a legal decision

vacate

200

English & grammer:
Consequentially, it's the misspelled word in the clue, as any proficient liaison wielding a daiquiri knows

grammar

200

A dried fruit & lying flat & facedown

prune and prone

200

You can recognize mule deer & elk tracks:
they have this many toes per print

two

200

[DD]

After Sputnik, our schools tried to catch up with the "new" type of this; it was quickly subtracted from the curriculum

math

300

9 letters:
to fluctuate, or to waver

vacillate

300

Music:
Meter like 4/4 or 3/2 at the beginning of a piece is called this "signature

time

300

It's the bedroom style on the right & what the person on the left is hoping for

loft and lift

300

In a "Sound of Music" song, it's the line that follows "Doe, a deer, a female deer"

ray, a drop of golden sun

300

You dipped a fountain pen, & sometimes a classmate's pigtails, into it

ink (or inkwell)

400

To let off steam, literally or figuratively

vent

400

History:
The 3rd & last Punic War ended with the destruction of this city & the enslavement of its people

Carthage

400

A litter of pigs & a long, shallow trench made by a plow

a furrow and a farrow

400

"The wild deer, wandring here & there, keeps the human soul from care", wrote this poet in "Auguries of Innocence"

(William) Blake

400

Microfilm is spooled in rolls; this similarly named medium can fit about 100 pages on a 4" x 6" sheet

microfiche

500

To slander or defame

to vilify

500

Science:
Lava & igneous rocks form from this molten rock

magma

500

[DD]

Often confused, one word means to cause a change in & the other is the result

effect and affect

500

Felix Salten created her as Bambi's love interest

Faline

500

This 5-letter word meaning "the same" was one name for copies made through spirit duplication; the smell was addictive

ditto