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innā
Indeed We
ACC – accusative particle inna + PRON – 1st person plural object pronoun ā
Root Link: ا ن ن
jaʿalnā
We have made
V – 1st person plural perfect verb + PRON – 1st person plural object pronoun nā
Root Link: ج ع ل
what
REL – relative pronoun
Root Link: م ا
ʿalā
(is) on
P – preposition
Root Link: ع ل ى
l-arḍi
the earth
DET – determiner prefix al + N – genitive feminine noun 
Root Link: ا ر ض
zīnatan
adornment
N – accusative feminine indefinite noun
Root Link: ز ى ن
lahā
for it
P – prefixed preposition lām + PRON – 3rd person feminine singular personal pronoun hā
Root Link: ل
linabluwahum
that We may test [them]
PRP – prefixed particle of purpose lām + V – 1st person plural imperfect verb, subjunctive mood + PRON – 3rd person masculine plural object pronoun Ha
Root Link: ب ل و
ayyuhum
which of them
INTG – nominative interrogative noun + PRON – 3rd person masculine plural object pronoun Ha
Root Link: ا ى ى
aḥsanu
(is) best
N – nominative masculine singular noun
Root Link: ح س ن
ʿamalan
(in) deed
N – accusative masculine indefinite noun
Root Link: ع م ل

Acknowledgements:

Single-Word Audio has been made possible through software provided by Arabic NLP

James Ada's concordance work; his research can be found at www.organizedQuran.com
Note: James is now a member of the IslamAwakened Continuity Board