Rule 1: 1. Nouns of trade and office: فِعَالَة
A noun of the pattern فِعَالَةٌ (kasra, then long ā, then ة) usually names a trade, craft, profession or office: تِجَارَةٌ commerce, صِنَاعَةٌ industry, craft, زِرَاعَةٌ agriculture, خِيَاطَةٌ tailoring, نِجَارَةٌ carpentry, حِدَادَةٌ smithing, طِبَاعَةٌ printing, وِزَارَةٌ ministry, the office of minister, سِفَارَةٌ embassy, ambassadorship, إِمَارَةٌ emirate, the office of emir, خِلَافَةٌ the caliphate, وِكَالَةٌ agency, كِهَانَةٌ soothsaying. Each stands beside a noun for the person: تَاجِرٌ (pattern فَاعِلٌ), خَيَّاطٌ and نَجَّارٌ (pattern فَعَّالٌ), وَزِيرٌ and سَفِيرٌ (pattern فَعِيلٌ). Learn them in pairs.
يَعْمَلُ أَبِي فِي التِّجَارَةِ مُنْذُ عِشْرِينَ سَنَةً.
yaʿmalu abī fi t-tijārati mundhu ʿishrīna sanatan
My father has been in trade for twenty years.
تَاجِرٌ → تِجَارَةٌ.
تَعَلَّمَتْ أُخْتِي الْخِيَاطَةَ مِنْ جَدَّتِهَا.
taʿallamat ukhtī l-khiyāṭata min jaddatihā
My sister learnt sewing from her grandmother.
خَيَّاطٌ → خِيَاطَةٌ.
تَوَلَّى الْوِزَارَةَ سَنَتَيْنِ ثُمَّ اسْتَقَالَ.
tawallā l-wizārata sanatayni thumma staqāla
He held the ministry for two years and then resigned.
وِزَارَةٌ: both the office and the ministry building.
ذَهَبْنَا إِلَى السِّفَارَةِ لِنَأْخُذَ التَّأْشِيرَةَ.
dhahabnā ila s-sifārati li-naʾkhudha t-taʾshīrata
We went to the embassy to get the visa.
سَفِيرٌ → سِفَارَةٌ.
اَلزِّرَاعَةُ أَهَمُّ صِنَاعَةٍ فِي هٰذِهِ الْبِلَادِ.
az-zirāʿatu ahammu ṣināʿatin fī hādhihi l-bilādi
Agriculture is the most important industry in this country.
Two nouns of the same pattern.