| birken | (adjective) consisting of or made of wood of the birch tree | Synonyms: birch, birchen |
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| darken | (verb) become dark or darker | - |
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| (verb) make dark or darker | - |
| (verb) tarnish or stain | - |
| darkened | (adjective) become or made dark by lack of light | - |
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| (adjective) (of fabrics and paper) grown dark in color over time | - |
| darkening | (adjective) becoming dark or darker as from waning light or clouding over | - |
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| (noun) changing to a darker color | Synonyms: blackening |
| harken | (verb) listen; used mostly in the imperative | Synonyms: hark, hearken |
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| hearken | (verb) listen; used mostly in the imperative | Synonyms: hark, harken |
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