照明【しょうめい】
illumination, lighting
参照【さんしょう】
reference (e.g. to a dictionary, passage, footnotes), consultation, comparison, browsing (to a file or folder)
対照【たいしょう】
contrast, antithesis, comparison
照会【しょうかい】
inquiry, enquiry, query, reference
照合【しょうごう】
collation, comparison
照らす【てらす】
to shine on, to illuminate, to compare (with), to refer to
照る【てる】
to shine, to look slightly upward (of a noh mask; indicating joy, etc.)