“فَ” (fa)This word introduces the result of a condition, like “then.”Corpus grammarRSLT — prefixed rslt particle.
“سَ” (sa)This word points the meaning toward the future, like “will.”Corpus grammarFUT — prefixed fut particle.
“نُيَسِّرُ” (nuyassiru)means “Then We will ease him” in this verse. It is a verb. an action or state word. Here it is imperfect verb, verb pattern two.Corpus grammarV — first person plural imperfect verb.
“هُ” (hu,)an attached pronoun meaning “he” or “him.”Corpus grammarPRON — third person masculine singular attached pronoun.