Hi Bonhio, welcome to the forum.
Try this;
Since “Singing” and “Singer” both have the word “Sing”,
You would have an image for “sing”, perhaps the image of “Musical Note” symbol.
You would then add a Letter Shape and Link the two together.
add an image for “R” to singeR,
add an image for “N” to singiNg.
Since R and N gives you the phonetics, it would be easy to add a letter shape/image.
For the letter R, you’d use the image of “Pincer” as a letter shape.
Or any image that may make sense to you as the letter R.
For the link action, you could perhaps imagine
“The music note is held by the Pincer” = SingeR
For the letter N = Compass (North)
You may imagine a single image as
“Music Note symbol in the middle of A Compass” = SingiNg
If you wanted to use “G” as the suffix,
The letter G = G-Clamp
So you may imagine;
“Music Note Clamped between the points of a G-Clamp” = SinginG.
Another example;
Arctic vs Antarctic
See if you can notice any syllable words that you can convert into images.
Arctic = Arc | Tic
Arc = Arch
Tic = Tick
Antarctic = Ant | Arctic
Ant = Ant
Arctic = as above.
Again use a link action to chain the two or three together as a single image.
The letter shapes/images of the Alphabet comes very handy to distinguish the words that are very similar.
Hope this helps.
Here is a link for the Alphabet peg list if you like to use it.