Paagi (Paak)
1) Beacon, sea mark, buoy; 2) Tank, cistern, water-tower; 3) Lump. Close enough to one of Tallinn’s prime sludge producers on Paljassaare peninsula, so could be any of them but, given it was named along with two (now defunct) neighbours in June 1958 – Taagi and Toodri – all three of which elongated vertical structures, more a sea mark type of beacon than a buoy.
Paakspuu (Paakspuu)
Aka harilik paakspuu, aka mõruuibu (bitter apple-tree, where uibu is probably a shortening of ubinapuu, an older/dialect term for apple-tree, see Õuna and Puu). Commonly known as alder, glossy or breaking buckthorn, black dogwood, Frangula alnus (aka Rhamnus frangula). Having said that, trees are often hard to identify exactly and the term paakspuu may also refer to the black alder (Alnus glutinosa), which might explain the paak (seamark or beacon), due to its durability under water (same wood used as pilings in [under] Venice, see Paali). Tree/shrub group, see Lõhmuse põik and Pukspuu.
Pääsküla (Pääsküla) 
Tallinn suburb renowned for its landfill and library. First recorded as Peskulae in the Liber Census Daniae (LCD) and assumed named after a ford over nearby river and related to the term läbipääs, or passage, walkway. One 19th‑C folk etymology claimed that since highways were infested with robbers, reaching Pääsküla (lit. ‘escape/salvation village’) meant safety. Also the name of one of the thousand-odd hawkweeds, this one known variously as pääsküla karutubakas (bear’s tobacco), or zizi hunditubakas (‘zizi’ wolf’s tobacco), Hieracium zizianum. While the specific zizianum is named for German botanist Johann Baptiste Ziz (1779-1829), it would be interesting to know whether the zizi was associated or conflated with susi, South Estonian for North Estonian hunt, wolf, borrowed from MLG for dog (or vice versa).