The words that we use countless times in our everyday speech, they, too, show striking aspects about them when reflected maturely. Two such words are ‘Na’ and ‘Naa’.
guu.njtii hai tirii hasii.n aavaaz
jaise naadiida ko.ii bajtaa saaz
JAAN NISAR AKHTAR

“Naa-Diida” means that which can’t be seen, or invisible. Another word, on the same lines, is ‘Nadiida’, meaning a greedy person. Although it literally means one who has not seen- why? -because a greedy person looks at a thing in a manner as if he had never seen it before. The word ‘Naa’, when prefixed to nouns, functions as a pleonasm, and conveys negation. For example, ‘Naa-Laaiq’, ‘Naa-Khush”, etc.
Those who know the language, know it well enough as to where and how ‘Na’, ‘Naa’, and ‘Nahin’ are to be used.
Na suno gar buraa kahe koi
Na kaho gar bura kare koi

Interestingly, Javed Akhtar's famous film song "Kuchh Naa Kaho, Kuchh Bhi Naa Kaho", although written to the tune, never comes out as an oddity. 
Let the purists say whatever they wish to!

In Urdu, ‘Naa’ is also used as an article of emphasis and affirmation. For instance:
Kisi buzurg ke bose ki ik nishaani hai
Humaare maathe pe thoDii sii raushnii hai naa

In the Iranian romantic tale of Shereen and Farhad, Farhad, who digs a mountain with his ax to draw a canal of milk, is called "Koh-Kan", meaning the one who digs a mountain.
kaam aa.ii kohkan kii mashaqqat na ishq me.n
patthar se juu-e-shiir ke laane ne kyaa kiyaa
Mirza Rafi Sauda 

This construction has made its way into Urdu from Persian. The word ‘Kan’ means a digger, and thus, a laborer digging in mine (Kaan) is called ‘Kaan-Kan’ or mine-digger. Likewise, the act of carving impressions into stone, wood, and metal is called ‘Kananda Karna’, or to engrave.
Kan also means ajar or edge. Like the idiom ‘Kan Ankhon se Dekhna’, meaning to look at from the corner of the eye.
Wo go kuchh na sunti na kahtii use
Kan aankhon se par dekh rehti use
(Meer Hasan- Masnavi Sehr-ul-Bayan)

Another Persian construction is ‘Kaar-Kun’, which is created by bringing together Kaar, meaning work in Persian, and Kun, meaning a doer, which together means one who carries out a work. Similarly, there are other such constructions like ‘Hairan-Kun’- that which astonishes, ‘Parishan-Kun’- that which disturbs or scatters, and many others.

The word ‘Afshan’ refers to golden flakes or filings that women sprinkle in the parting of their hair or foreheads as adornment. Afshan is especially graced upon, or “etched (Chuna Jaana)” into, a bride’s parting of hair. A couplet of Qamar Jalalvi’s reads:
'qamar' afshaa.n chunii hai ruKH pe us ne is saliiqe se
sitaare aasmaa.n se dekhne ko aa.e jaate hai.n

In Urdu, the word Afshan is also used as a suffix in the sense of sprinkling, shedding, or scattering. Girls are commonly named "Mehr Afshan" (She who spreads love) and “Noor Afshan”. In couplets, we see the heavens scattering dew (Shabnam-Afshani) on somebody’s grave, or someone shedding flowers (Gul-Afshani) from their eloquent conversation. Like Ghalib, in this following couplet:
phir dekhiye andaaz-e-gul-afshaanii-e-guftaar
rakh de ko.ii paimaana-e-sahbaa mere aage
In Urdu, another idiom is present for the expression ‘gul-afshaanii-e-guftaar’, namely ‘Phuul JhaDna’. A famous verse by Ahmad Faraz reads:
sunaa hai bole to baato.n se phuul jha.Dte hai.n
ye baat hai to chalo baat kar ke dekhte hai.n
Another Urdu word ‘Ifsha’, means to reveal a secret. In thousands of Urdu couplets, the secret of love is revealed through eyes. Also, interrogation done by the police to solve a crime is called ‘Taftish Karna’.