سَعْيَكُم

سَعْيَكُم is a phrase (شِبْهُ الجُمْلَةِ) consisting of a possessive nominal compound

PhraseNoun / NounNoun Noun
شِبْهُ الجُمْلَةِمُضَافٌ وَ مُضَافٌ إِلَيْهِمُضَافٌ إِلَيْهِمُضَافٌ
PhrasePossessive compoundPossessive noun / ownerNoun possessed / owned
Your strivingسَعْيَكُم=كُم+سَعْيَ
running of yoursyoursrunning of, striving of
Surah/Below is the only verse in the holy Quran containing the compoundسَعْيَكُم
Verse
92-4undoubtedly your efforts are most diverseإِنَّ سَعْيَكُم لَشَتَّى