What are the maening of these words? Homonyms Polysemous Homograph Heteronym Synonym Antonym Could give me some example of each parts?

I am looking for some examples of English vowels, diftongs, triptongs what is the best website?

To distinguish English vowels are very difficult expecially as foreign languange. I am looking for some examples for each part of English vowels ( front vowel, central vowel, and back vowel), difhtongs, tripthongs.

Phonologhy part III Today we came back again to study Phonology, after 2 weeks mom got sick. And there is no quiz today. It is the first time there is no quiz. Ok, I will tell you what I have learnt to today on third meeting studying of phonology. Yeah.. We studied English vowel. What is English vowel? Actually there are three parameters of English vowels; the height of the tongue (the openness of the mouth) close, half close, open; the position of the tongue front, central, and back; the shape of the lips, rounded, spread. And Jackson (1985) classified vowels into two categories: 1. Pure vowels (Simple vowels) During the articulation, they are made with the mouth taking up single position. * Rounded and unrounded * Long and short * Low and high * Front and back 2. Diphthongs The configuration of the mouth changes in the course of articulation Then he taught us the parts of the vowels. The first is pure vowels, there six parts on pure vowels; the rounded vowels, the unrounded vowels, long and short vowel are phonemic in English, low vowel occur when the jaw is relatively low during articulation, front and back vowel. He taught us one by one and he gave us some examples and the description from each part on pure vowels. The end of the lesson she gave us homework to find some examples base on the material that we learnt today. She asked us to make some groups, and all of groups consist of four members. Gusty, Reny, and Rina were in my group. She gave us homework not only to find examples of pure vowels but also to make video. We must make story telling video that we tell to children. Oh.. no…

Phonologhy part III Today we came back again to study Phonology, after 2 weeks mom got sick. And there is no quiz today. It is the first time there is no quiz. Ok, I will tell you what I have learnt to today on third meeting studying of phonology. Yeah.. We studied English vowel. What is English vowel? Actually there are three parameters of English vowels; the height of the tongue (the openness of the mouth) close, half close, open; the position of the tongue front, central, and back; the shape of the lips, rounded, spread. And Jackson (1985) classified vowels into two categories: 1. Pure vowels (Simple vowels) During the articulation, they are made with the mouth taking up single position. * Rounded and unrounded * Long and short * Low and high * Front and back 2. Diphthongs The configuration of the mouth changes in the course of articulation Then he taught us the parts of the vowels. The first is pure vowels, there six parts on pure vowels; the rounded vowels, the unrounded vowels, long and short vowel are phonemic in English, low vowel occur when the jaw is relatively low during articulation, front and back vowel. He taught us one by one and he gave us some examples and the description from each part on pure vowels. The end of the lesson she gave us homework to find some examples base on the material that we learnt today. She asked us to make some groups, and all of groups consist of four members. Gusty, Reny, and Rina were in my group. She gave us homework not only to find examples of pure vowels but also to make video. We must make story telling video that we tell to children. Oh.. no…