Difference between Perceptive and Observant

PERCEPTIVE vs OBSERVANT: NOUN

An Observantine.
A sycophantic servant.
One who observes forms and rules.
An observer.
An obsequious or slavish attendant.
One who is strict in observing or complying with a law, rule, custom, etc.
[capitalized] Specifically, a member of the more rigorous class of Franciscans which in the fifteenth century became separated from those — the Conventuals — following a milder rule.

Alert and paying close attention.
Quick to notice; showing quick and keen perception
Paying close attention especially to details
(of individuals) adhering strictly to laws and rules and customs
Diligent in observing a law, custom, duty, or principle.
Submissively attentive; obediently watchful; regardful; mindful; obedient (to); -- with of, .
Taking notice; viewing or noticing attentively; watchful; carefully attentive.
Having or showing keen perceptiveness; perceptive.

Of or pertaining to the act or power of perceiving; having the faculty of perceiving; consisting in perception.
The perceptive faculties.
Keen in discernment

Watching; watchful; observing; having or characterized by good powers of observation, or attention, care, accuracy, etc., in observing: as, an observant mind; a man of observant habits.
Attentive; obedient; submissive; ready to obey and serve; hence, obsequious: with to or of before a personal object.
Carefully attentive in observing or performing whatever is prescribed or required; strict in observing and practising: with of: as, he was very observant of the rules of his order; observant of forms.
Synonyms and
Watchful, mindful, heedful, regardful.
Quick to notice
Showing quick and keen perception

Discriminating, Apprehensive, Acute, Observing, Keen, Piercing, Understanding, Penetrative, Sharp, Penetrating, Discerning, Subtle, Observant, Incisive, Insightful

Observer, Alert, Caring, Aware, Careful, Scrupulous, Thoughtful, Attuned, Vigilant, Watchful, Law abiding, Lawful, Observing, Perceptive, Attentive

Discriminating, Apprehensive, Acute, Observing, Keen, Piercing, Understanding, Penetrative, Sharp, Penetrating, Discerning, Subtle, Observant, Incisive, Insightful

Observer, Alert, Caring, Aware, Careful, Scrupulous, Thoughtful, Attuned, Vigilant, Watchful, Law abiding, Lawful, Observing, Perceptive, Attentive

He was fair but ruthless, canny and perceptive.
Some perceptive passes opened up the Arsenal backline.
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First of all you asked extremely perceptive questions.
He obviously is a deep and perceptive person!
Thank you for your rare and perceptive analysis.
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Perceptive Perceptive people are curious, adaptable and spontaneous.
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She is observant of school rules and policies.
Parents should be observant of actions, behaviors, andmoods.
Observant Jains will literally not harm a fly.
Derek was so observant and on his guard.
Knowing how to eat clean means being observant.
An observant study especially of the 18th century.
Greenbaum was raised and remained an observant Jew.
He really saved the day by being observant.
You are correct and, as usual, very observant.
There was little difference in opinion between observant and less-observant Catholics, women and men, and among age groups, the poll found.