They are homographs.
object
each of two or more words having the same pronunciation but different meanings, origins, or spelling, for example new and knew.
Words that have the same meaning but different spelling are called homophones. These words sound alike but are spelled differently and have different meanings. Examples include "bare" and "bear", "to" and "too", "write" and "right".
A homograph is a word that is spelled the same as another word, but has a different meaning and often a different pronunciation. An example of a homograph is "bat" (flying mammal) and "bat" (sports equipment).
That is the correct spelling of "meaningful" (having a definite meaning or effect).
Homophones are words that sound the same but have different meanings and often different spellings. For example, "their," "there," and "they're" are homophones because they are pronounced the same but have different meanings.
a synonym is a word with different spelling but the same meaning an antonym is a word with opposite meaning a homophone is a word having the same pronunciations with different meanings
A homonym is a word that has the same spelling but a different meaning. So for thundered it would be thundered! Thundered having two different meanings, I guess maybe like the noise you hear after lightning, and a noise similar to it or something.
The spelling is "surgery" for an internal medical procedure. The similar word "sugary" is an adjective meaning having a sweet taste.
two or more words having the same spelling but different meanings
The spelling is "significant" (notable, or having some bearing).
The correct spelling of the word is "stripy" which means having stripes.