McDonald's
Cylinders.
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.
Do not use an apostrophe to make a number plural. 1990s is the plural form of 1990