古往今来[kooukonrai] in all ages
古今[kokon] ancient and modern times
古今東西[kokontouzai] all times and places
古今無類[kokonmurui] best ever

今か今か[imakaimaka] eagerly waiting
今が今[imagaima] just now
今が今まで[imagaimamade] till just now
今しがた[imashigata] moment ago

只管[hitasura] nothing but
只中[tadanaka] middle
只今[tadaima] Here I am
只ならぬ[tadanaranu] unusual
只只[tadatada] absolutely

只者[tadamono] ordinary person (usu. in neg. sentences)
真只中[mattadanaka] right in the midst of
只乗り[tadanori] free ride (e.g. on train)
只働き[tadabataraki] working for free