I am unable to change the fonts in
http://www.thai-language.com/ref/typographical-styles . I don't know if my browser is having difficulty or whether the site is malfunctioning. Is anyone else having this difficulty?
However, the font that currently shows on screen - the first font - I believe illustrates Gillian's question.
In the first like is the word
ประเสริฐ. The last two consonants in this word look strikingly similar, ignoring the curlicue under the last consonant. the first of these two is "
ร" and the second is "
ฐ".
In the fifth line is the word
โกรธ. Here the last two consonants also look similar. The penultimate consonant is again "
ร" and the final is "
ธ". In this font sent, "
ธ" has the same body shape as "
ฐ", save for the curlicue.
Note, however, that the bottom portion of the "
ร" in this font sent is identical to the top portion, giving a shape which does indeed resemble the English "S". On the other hand, the bottom portion of the "
ธ" and "
ฐ" is slightly elongated and narrower than the upper portion.
I don't think that context is necessary to distinguish these elements, although it is certainly true that this font set does not highlight differences. I do not give these types of fonts high marks for legibility.