Yes, the word 'observant' is a noun, an obsolete word for a member of a religious group or order that follows strict religious laws. The word 'observant' is an adjective, a word that describes a noun as noticing everything that happens; quick to notice.
a word that means that question is "thow out"
The study of small living things
It's the longest word in English and it means to estimate things to be small or useless.
The word sensing can mean a few things depending on how it is used. It means being aware of things around you through ones senses or perception of something that has occurred.
quick
It means when you notice things about your body/face in a photo that are unnoticed in real life
Mercurial means quick and changeable in temperament.
jog is quick where did you get this question from.
overlook
speedy, quick
vibration ***** The word is oscillate.
Notice
Ambush.
glance, peek
wiki wikiWiki is the Hawaiian word for quick. Wiki wiki means "quick quick". Wiki wiki wiki means "quick quick quick" and so on. Yes, it does sound like a combination of wikipedia and a rapper.
Capricious, and fickle mean quick and changeable in temperament.