SIRAATUN
Comparison with Synonyms and Contradistinctions
Siraatun : The way on which one has to move carefully:
Tariiq : Road (Common word):
Sabiil : A convenient way on which there is traffic :
Fajja : A way through two mountains (Mountain Pass):
Imaam : Highway (Highway of information (Clear Book):
Najad : Elevated road:
Huda : The right path found by one who lost the way:
Sabab : Resources (Way, Way out):
( Mutaradifaatul Quran, Abdur-Rahmaan Kailani)
Also see Shara' , Sanna', and Ibtada’.

Al-Mustaqiim: Right, Straight - righteous, upright, well constituted:
Beaten - a straight, smooth, much walked path:
Istaqaam: To straighten to raise, get up, stand up, to be or to become straight.
Yastaqiim: Keeps straight:

"Unto whosoever of you willeth to walk (or keep himself) straight"
(Vocabulary of the Holy Quran, Dr Abdullah Abbas Nadvi)

Istaqaam: To be straight forward. To return to [God: e.g., sinner return (with `Ilaa')]
Istaqaamat: To abide. (F.Steingass)
Istaqaam: In good order, be correct, upright (in one's conduct)
Istaqaamah: Rectitude, right or normal state (of a thing). (Wortabet)
Mustaqiim ('Qaaimun'): Straight, (remaining straight, continuing to remain straight) . (Lughatul Quran, Muhammad Abdur-Rashid Nomani)
Istaqaam: Straight – Balanced. (Al-Munjid, Daarul Ishaa-at , Karachi.)
Sabit: To remain steadfast on something:
Istaqaam: To pursue a right thing with perseverance without wandering:
Istabir: To face difficulties with steadfastness, with patience

Raabit: To remain firm on something which requires security:
Qasad : Balanced in using anything:
Sawwaa : Level, straight and correct :
Sawaa ' : Passing through the middle straight :
Sadiid : Strong, clear and straight :
Mustaqiim : Moderate, balanced and straight:

(Pages 377-378 and 599-601, Mutaradifaatul Quran, Abdur-Rahmaan Kailani)