[英语课]

鑫(xīn) 淼(miǎo) 焱(yàn) 垚(yáo) 犇(bēn) 掱(pá) 瞐(mò)畾(lěi) 骉(biāo) 羴（shān）猋（biāo）麤（cū）鱻（xiān）赑（bì）聶（niè）矗（chù）龘（tà、dá）厵（yuán）飝（fēi）刕（lí）尛（mó）歮（sè）飍（xiū）雥（zá）嚞（zhé）

[carolgreen481]

these words looks so difficult to write

[MSL]

  They consist 3 identical characters. For example 焱 is composed by 3 火.
Not that difficult, right? 

[PTC]

 Right

[SEO]

  I'd quote them bigger (size=36pt) for better understanding: 鑫(xīn) 淼(miǎo) 焱(yàn) 垚(yáo) 犇(bēn) 掱(pá) 瞐(mò)畾(lěi) 骉(biāo) 羴（shān）猋（biāo）麤（cū）鱻（xiān）赑（bì）聶（niè）矗（chù）龘（tà、dá）厵（yuán）飝（fēi）刕（lí）尛（mó）歮（sè）飍（xiū）雥（zá）嚞（zhé). Good!

[MSL]

 

四叠

There are also 四叠. For example: 朤 (lǎng), 燚 (yì), 叕 (zhuó), 茻 (mǎng).