No because on is an adjective, not a noun.
Fournesses is the plural of Fourness
Folisis is the plural of Folisi
Do not use an apostrophe to make a number plural. 1990s is the plural form of 1990
To pluralize "Walsh," you would use "Walshes." So, your sentence would be: "I would like to thank all the Walshes."
Add an apostrophe - Russ'
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.