The nature of Thai is such that many words sound very similar, such as the same words but with different tones,
or long vowels vs. short vowels or even similar sounding vowels in some cases. If you're new to the language
it can be challenging getting to grips with the tones.
Also in Thai, many words are identical but can have different meanings, for example ตา means 'grandfather'
and it also means 'eye', and กา means 'crow' as well as 'kettle'. These two examples are
taken from the very first pages of the first level primary school textbooks that Thai children are introduced to
in school. It's completely normal to native Thai speakers. To non-native speakers new to the language it can
be a source of confusion.
Context will usually help when determining the meaning of the words, however it's important to pronounce, and
to be able to hear, the difference between the Thai tones and the difference between the long vowels and short
vowels. And not to mix other similar sounding words as you're progressing with your studies.
The 'Similar Sounding Words' section of the View Flashcard page lists any words that could cause some confusion
and are worth listening to and practising together to help you become familiar with the differences (assuming the words
aren't identical).