  We present far-UV spectroscopy obtained with HST for 48 blue objects in the
core of 47 Tuc. Based on their position in a FUV-optical colour-magnitude
diagram, these were expected to include cataclysmic variables (CVs), blue
stragglers (BSs), white dwarfs (WDs) and other exotic objects. For a subset of
these sources, we also construct FUV-NIR SEDs. Based on our analysis of this
extensive data set, we report the following main results. (1) We
spectroscopically confirm 3 previously known or suspected CVs via the detection
of emission lines and find new evidence for dwarf nova eruptions in two of
these. (2) Only one other source in our spectroscopic sample exhibits marginal
evidence for line emission, but predicted and observed CV numbers still agree
to within a factor of about 2-3. (3) We have discovered a hot (T_eff = 8700 K),
low-mass (M = 0.05 M_sun) secondary star in a previously known 0.8 day binary
system. This exotic object is probably the remnant of a subgiant that has been
stripped of its envelope and may represent the ``smoking gun'' of a recent
dynamical encounter. (4) We have found a Helium WD, the second to be optically
detected in 47 Tuc, and the first outside a millisecond-pulsar system. (5) We
have discovered a BS-WD binary system, the first known in any globular cluster.
(6) We have found two additional candidate WD binary systems with putative main
sequence and subgiant companions. (7) We estimate the WD binary fraction in the
core of 47 Tuc to be 15 +17/-9 (stat) +8/-7 (sys). (8) One BS in our sample may
exceed twice the cluster turn-off mass, but the uncertainties are large. Taken
as a whole, our study illustrates the wide range of stellar exotica that are
lurking in the cores of GCs, most of which are likely to have undergone
significant dynamical encounters. [abridged]
