The masculine plural definite article 'gli' shows that you mean 'the hobbies' when your topic is 'gli hobby' in Italian. It's pronounced 'lyee'. The masculine plural indefinite article 'degli' shows that you mean 'some hobbies' when your topic is 'degli hobby'. It's pronounced 'DEH-lyee'.
Cylinders.
McDonald's
cobwebs
Martinez's
boats
You wouldn't pluralize "processing", but you would pluralize "process" making more than one process "processes".
Handkerchiefs is correct.
Fournesses is the plural of Fourness
Sirs is the plural of sir
Folisis is the plural of Folisi
The plural form of panic is panics.
Do you mean, "How do you pluralize the phrase 'follow God's word' ? 1) Follow the words of God, or 2) Follow God's words.