industry

the setting sun; slanting rays of the evening sun / (figuratively) decline, fading

産業化: industrialization

業者: dealer, trader, merchant; manufacturer, contractor

industrialization (a process of social and economic change)

製糸業者: silk manufacturer / 製紙業者: paper manufacturer

vendor, merchant, dealer / manufacturer, contractor, maker

declining aristocracy, an elite class of people displaced by changes in society / (specifically) the Japanese upper class brought to ruin after World War II

亜酸化窒素: nitrous oxide

The hiragana syllable ぎょ (gyo). Its equivalent in katakana is ギョ (gyo).