Let me try to explain, and please follow the links and read some more on wikipedia.
Linguistics is a complex area in which i am only exploring and actually i know almost nothing about.
The basis of any language is formed around specific rules.
One of those rules is how word are deformed when using them. That is called You are not allowed to view links.
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If a word changes based on the particular position of a sentence there are different You are not allowed to view links.
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In this particular case of the word spaces, everybody is unaware of the fact that English, and many other Indo-European languages have very limited You are not allowed to view links.
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In this instance i used the word "grammatical case" to explain the matter.
"Languages such as You are not allowed to view links.
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have extensive case systems"
That is important if you compare vords.
Example: take the verb: "flabbermayonaised"
Assume it is unique in the VMS. But it is a verb.
This means there is a stem. In this case I assume the stem is mayonaise. You need to look for that word "mayonaise" also when you compare labels with the text.
In for example Hebrew it is even worse: the stem will change considerably based on the "case" to a point where you can not recognize it anymore.
For example in this scenario, the stem could be changed to: "manaized". You can hardly recognize it.
There are no good techniques to find the stemming in general.
For some languages there is extensive software where all the known nouns and verbs are listed with the inflections.
That is not really usable here of course, so i tried to find different methods for comparing vords. I am not sharing that method here, but i just wanted to point out that simply compare the words, is not enough on itself and you need to go beyond that.