Rule 1: 1. Nouns of trade and occupation: فَعَّالٌ
A noun denoting a workman, artisan or habitual doer is formed on the pattern فَعَّالٌ: from خَبَزَ to bake comes خَبَّازٌ baker, from نَجَرَ to plane wood نَجَّارٌ carpenter, from حَدِيدٌ iron حَدَّادٌ blacksmith, from خَيْطٌ thread خَيَّاطٌ tailor, from طَبَخَ to cook طَبَّاخٌ cook, from فَلَحَ to till فَلَّاحٌ peasant, from حَمَلَ حَمَّالٌ porter, from بَقْلٌ greens بَقَّالٌ grocer. When the third radical is و or ي it appears as hamza after the long ā: بَنَّاءٌ builder (from بَنَى), سَقَّاءٌ water-carrier (from سَقَى). The feminine adds ة: خَيَّاطَةٌ seamstress, طَبَّاخَةٌ a woman cook; the plural is sound, خَبَّازُونَ, نَجَّارُونَ, فَلَّاحُونَ, beside a few collective plurals in ة such as جَمَّالَةٌ camel-drivers (from جَمَّالٌ). The noun is declined like any triptote and takes the article: اَلْخَبَّازُ, دُكَّانُ النَّجَّارِ.
يَفْتَحُ الْخَبَّازُ دُكَّانَهُ قَبْلَ طُلُوعِ الشَّمْسِ.
yaftaḥu l-khabbāzu dukkānahu qabla ṭulūʿi sh-shamsi
The baker opens his shop before sunrise.
صَنَعَ النَّجَّارُ بَابًا جَدِيدًا لِلْمَسْجِدِ.
ṣanaʿa n-najjāru bāban jadīdan li-l-masjidi
The carpenter made a new door for the mosque.
خَاطَتِ الْخَيَّاطَةُ ثَوْبَ الْعَرُوسِ فِي أُسْبُوعٍ.
khāṭati l-khayyāṭatu thawba l-ʿarūsi fī usbūʿin
The seamstress sewed the bride's dress in a week.
Feminine فَعَّالَةٌ.
اَلْبَنَّاؤُونَ يَعْمَلُونَ فِي الشَّمْسِ وَالْحَدَّادُ يَعْمَلُ عِنْدَ النَّارِ.
al-bannāʾūna yaʿmalūna fi sh-shamsi wa-l-ḥaddādu yaʿmalu ʿinda n-nāri
The builders work in the sun and the blacksmith works by the fire.
بَنَّاءٌ from a defective root; its sound plural is بَنَّاؤُونَ.
كَانَ جَدِّي سَقَّاءً يَحْمِلُ الْمَاءَ إِلَى الْبُيُوتِ.
kāna jaddī saqqāʾan yaḥmilu l-māʾa ila l-buyūti
My grandfather was a water-carrier who carried water to the houses.
اِشْتَرَى الْفَلَّاحُونَ آلَاتٍ جَدِيدَةً مِنَ الْمَدِينَةِ.
ishtara l-fallāḥūna ālātin jadīdatan mina l-madīnati
The peasants bought new machines from the city.