For example, cyclobutane and methylcyclopropane are isomers of each other (C4H8), but are not isomers of butane (C4H10).
fɔːɹ ɛɡzˈæmpəl, sˈaɪkləbjˌuːteɪn ænd mˌɛθəlsˌaɪkləpɹˈoʊpeɪn ɑːɹ ˈaɪsəmɚz ʌv ˈiːtʃ ˈʌðɚ sˈiː fˈoːɹ ˈeɪtʃ ˈeɪt, bˌʌt ɑːɹ nˌɑːt ˈaɪsəmɚz ʌv bjˈuːteɪn sˈiː fˈoːɹ ˈeɪtʃ tˈɛn.