濃化 is read as のうか (nouka) and means thicken.
のうか
nouka
のうこう
passionate
こい
strong (flavour, smell, etc.)
のうど
cardinality
のうどけい
densitometer
りょくか
greening (i.e. planting to increase greenery)
なんか
blanching (of vegetables; by depriving them of light)
こうか
upturn (in the market)
みんえいか
privatization
えんか
chloride
きかいか
mechanization
えきか
liquefaction
どんか
becoming dull