What is the key difference between ghulāmī and ʿaṣāya?

Iḍāfah to Yāʾ al-Mutakallim and the Six Nouns

• ʿAṣāya has no mudāf ilayh
• Ghulāmī is a verb
• ʿAṣāya retains a maqṣūr alif; ghulāmī follows the sound-noun rule
• Both are sound masculine plurals